Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb3c5f5a4d5a965…

MALICIOUS

PDF

89.2 KB Created: 2021-03-07 13:06:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e9af425a7b277a94b12184f7edc5a1e2 SHA-1: f6dc0324a97104a15831020c1fda2695354b9d24 SHA-256: 1cb3c5f5a4d5a96586a4d06df141ac77cc2d75bba5e133c2cf81c0fb32b53ca7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to obscure the ultimate destination. One prominent URL, https://jumiwimov.ru/strik?utm_term=2012+jeep+grand+cherokee+laredo+4x4+specs, appears to be a lure for users searching for vehicle specifications, likely leading to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jumiwimov.ru/strik?utm_term=2012+jeep+grand+cherokee+laredo+4x4+specs PDF link annotation
    • http://zabavnyi-slon.ru/kunalogyukrg.pdfIn PDF document text
    • https://lewuseloti.weebly.com/uploads/1/3/1/4/131437615/xilogoso.pdfIn PDF document text
    • http://biweekamnf.com/manual_for_maytag_bravos_xl_dryer1ewfq.pdfIn PDF document text
    • http://pollsexpert.com/webkinz_cheats_for_estore_pointsabh6a.pdfIn PDF document text
    • https://jejaxome.weebly.com/uploads/1/3/4/4/134443668/e12089c.pdfIn PDF document text
    • https://sakofavore.weebly.com/uploads/1/3/3/9/133997309/9733105.pdfIn PDF document text
    • http://qrastenmap.online/s3_bucket_website_url_formato52pi.pdfIn PDF document text
    • https://jevezorubik.weebly.com/uploads/1/3/4/8/134864628/jumib_befom_bezude.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_c369aa5faec0437cb9b9aa2b56aa9940.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c868238-eeec-4eee-b719-dfc67a424b3c/herman_miller_aeron_office_chair_headrest.pdfIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_eaf9e5ed2fa1460c941d31f5e90e95c1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/35c785b9-ece5-4bfe-8e62-f3c9ab4eeece/echo_leaf_blower_pb-580t.pdfIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_f013cc9f5dc5486d9b98922436027da4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/84e71677-9e0b-488e-ba49-c8046c8be4d2/good_persuasive_speech_topics_for_college_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d86a6ed6-792b-48d4-a3d0-3fb204736f84/ranunanosusedojolober.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01a964f2-f155-403b-a4fa-c9b746db2671/is_audio_technica_good_for_gaming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9922a828-600f-43ba-888b-36a8769a6302/how_to_fix_keyboard_not_working_windows_7.pdfIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_4c2cc8d6df774aca95c675d8f0c69406.pdf?index=trueIn PDF document text
    • https://ddb0fe67-a09a-413d-b59a-c21b1dde3186.filesusr.com/ugd/3f0e57_ef6d3435f4a8420fbbb0c1ef2ef412e1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/29be727b-6b8c-47ac-a7c0-8feda8407cfc/korean_grammar_in_use_beginning_to_early_intermediate_free.pdfIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_bd548e2ce93e489d922d5f641de7a5b5.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000fd65.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFD65 13420 bytes
SHA-256: 58a36426111c1b8a79206fb3911d8c888f8396b08e0b563c57769c4a559c7b5f
font_00_sfnt_off0000eab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB4 5520 bytes
SHA-256: 47f165db0bd649c2dbd52e76707068b0e1bebf20b4686025085e9d0290c0f771
font_02_sfnt_off0001234d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234D 11452 bytes
SHA-256: 9e47a551309dca6a8706a850ee6e569c6ecfd9ff7ec193e708f3bdb26f56c48a
font_03_sfnt_off000148db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148DB 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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