Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41c670f45b06d7c…

MALICIOUS

PDF

82.5 KB Created: 2021-05-02 19:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8f55efb64bf715fd9874b3388ab8c582 SHA-1: 5fa919b0c9b16ea8f33614f53c9086dc63214b62 SHA-256: f41c670f45b06d7cb1a7faae2776ad1cee93d889a1980dfc4900d41b8ec16e22
134 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users. The presence of urgency lures further supports a phishing or malicious download attempt. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=vizio+d32h-c0+32-inch+720p+led+tv+%25282015+model%2529 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501501/normal_605d7e87b752c.pdfIn PDF document text
    • http://xenalebosob.scienceontheweb.net/pajaxazesaxebetapejuraf.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvesanap/8hgjiTo/voicemail_not_working_on_iphone_7.pdfIn PDF document text
    • https://cdn.sqhk.co/savaketiju/hdih4Kk/483560028.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489440/normal_5fcdc69f63683.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421471/normal_601fe2ea42048.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527345/normal_5fd93b7236f6e.pdfIn PDF document text
    • https://cdn.sqhk.co/zobelekivix/cKKeXb5/stackable_washer_and_dryer_for_rv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374696/normal_5fcb8dd661e0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458621/normal_6063185ab68c5.pdfIn PDF document text
    • http://sogixusi.medianewsonline.com/91526163405.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369308/normal_602a28be18a33.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/logo_quiz_world_answers_level_15.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/etymology_word_list.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/51001234974.pdfIn PDF document text
    • http://pekafujojef.onlinewebshop.net/calculus_and_analytic_geometry_by_zia_ul_haq_notes.pdfIn PDF document text
    • http://pavabiza.atwebpages.com/albert_camus_etranger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c7f7fe8-f9f1-4c41-9bdc-12385ae42857/44887951250.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80a7664a-f232-4190-a55c-f4e8b50c5a96/how_to_add_menu_header_in_wix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e41d57ca-07e0-4332-92e3-797c0a84d33a/reset_pioneer_sph_da120.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/79302670287.pdfIn 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://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AB 5784 bytes
SHA-256: ad39ec2f8b1e1814419962dc4abdf14a923d544b8cc1bceb838d6afc2c472316
font_01_sfnt_off0001076c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076C 6068 bytes
SHA-256: d8e4b7f44dfb66ea49c7f1cefd345a391fade3fb548cc17de4cdbf151663dabd
font_02_sfnt_off0001171d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171D 10856 bytes
SHA-256: 902fbb14ed113f6f3b1a63123573ef69daab0ba68ade34d69efe69805c243a8b