Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac0c825402d1028…

MALICIOUS

PDF

73.5 KB Created: 2021-03-12 01:48:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8701494be1a67ccf04d2db533680b6ed SHA-1: 287b73c04c0c326a011a77a8ae0f6991b86a54be SHA-256: 6ac0c825402d1028a3d8ffc3658dc40c71f09fa8012454ea82cf96146af0719f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pelibifir.ru/award?keyword=cengage+math+calculus+pdf+download PDF link annotation
    • http://zinepifulew.22web.org/dixokababakaja.pdfIn PDF document text
    • http://gonisavuxur.iblogger.org/latest_yahoo_mail_for_windows_7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rozibata.epizy.com/define_information_availability_bias.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/convert_to_word_macbook_air.pdfIn PDF document text
    • https://d896c2b7-539c-4146-aa8a-b39d26e096d8.filesusr.com/ugd/a98ecc_c7307824b7e341baa57e0f6b5bf75100.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/131a2071-a3ff-4424-829f-600156ea7dc4/ditalisenitosevo.pdfIn PDF document text
    • http://dejomogilum.rf.gd/how_to_setup_airprint_on_brother_mfc-j4510dw.pdfIn PDF document text
    • http://daxafedijumexir.rf.gd/oxford_achiever_app_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/73420913401.pdfIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_287639ef26c74c53bb7dae5eae3dd502.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kabisebax/simple_present_tense_worksheet_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35117095-5c18-42f2-ad83-5f5c10183f6c/kagoxulipovusirap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55c4ba00-dc86-4953-a119-158d3c32c1bb/21814397093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4003fcd-eb89-44e4-8ed6-fe9b3f87bc23/what_are_colleges_looking_for_in_a_personal_statement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0673eb8-8398-42cd-8d71-f9f4cd74148f/how_much_do_union_pipefitters_make_in_california.pdfIn PDF document text
    • http://rolozipufulelo.rf.gd/harvest_moon_light_of_hope_guidebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24c37f3d-c1c3-4b83-85ce-14c489c22bcb/45314862109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30acc8d3-e102-4c86-85e1-79b5f03b5f6b/fugujatopalakesapajotaror.pdfIn PDF document text
    • http://bosulug.epizy.com/insignificant_thing_crossword_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d934ca0-caaf-4d25-b4a5-1ede13cc0317/how_does_thyroid_hormone_affect_bone_growth.pdfIn PDF document text
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_73441d02fcce4914be2453fb35b58b8f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/64553ef9-0fc0-462d-a168-7bf681162b4c/intermatic_timer_set_up.pdfIn PDF document text
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_c0c7e73b905a48e48010f3956139313d.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE170 5472 bytes
SHA-256: 9c94c5fee519ef289d34b8081a9521a3fd86a956826dce939f1e1b41cb1e89de
font_01_sfnt_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 10612 bytes
SHA-256: 106a7d881d4115eef1343a1a58e06556432861924847159c5262f706ed173c75

Open this report in the interactive analyzer, or submit your own file for analysis.