Malicious PDF — malware analysis report

Static analysis result for SHA-256 37fad4a97856660a…

MALICIOUS

PDF

106.7 KB Created: 2021-03-18 08:35:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 021331f35431489bdee467ecb0bcd3f0 SHA-1: 2a26e9836b04a36848f55ce1aa3859fa03b1973c SHA-256: 37fad4a97856660a0eeae22bf7f11b6fa6d340ed30bc5c27981995b7029f0660
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files hosted on various domains. Heuristics indicate this is a link farm, potentially for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://leonvi.ru/aws?utm_term=feistel+cipher+structure+slideshare PDF link annotation
    • http://varietystore.website/culo_definition_spanskauop9s.pdfIn PDF document text
    • http://harkateine.fun/372999764247hqmw.pdfIn PDF document text
    • http://toolsbestpricemicrometer.site/hurst_review_book_answersfiprw.pdfIn PDF document text
    • http://lnstagramverifiedbadge-media.com/rulezokofugodunimicnsb.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/scag_mower_service_manualslvya.pdfIn PDF document text
    • http://giocodigital.space/does_leo_die_in_the_blood_of_olympusq4d3f.pdfIn PDF document text
    • http://pay-order.info/kobuzc1gue.pdfIn PDF document text
    • http://allieshouseofhope.com/892449489011kfvf.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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://uploads.strikinglycdn.com/files/5ca52c06-de0b-4b37-8c44-0f65aeb506b5/fafurozufixiduxokixowul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/446c7a32-0787-469a-9401-57f921aaad7f/pixenuwifubixatuweb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7ef4a3f-ec47-461e-87ec-784df16dd5fa/40894585359.pdfIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_6c17a1bccdc743f687131ef8dea2fb86.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/lesokakonobotodi.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/how_to_get_rid_of_acne_bumps_on_back.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/does_kanawha_county_have_school_tomorrow.pdfIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_6e0574473e904b59b3479c4cb389d64b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c64f5bfb-fbd7-4ef1-85b4-422989bb9ebf/ziselarotuwozumasak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/755417c1-0fda-456e-b094-67e0f96538db/zifijuj.pdfIn PDF document text
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_181cd6086a3442fda7ff771389f45109.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4df5db22-bb4d-4279-90b3-670e8f19ed82/how_to_tell_liftmaster_model.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/13285409721.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13645 1656 bytes
SHA-256: b8e2606848dd542994aab17900cea03d4a6d2db1b8011654ec1939989369681f
font_01_sfnt_off00013ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA4 4780 bytes
SHA-256: 0e7590b5e8b427212be6cd6f8a2db58e787bebcbc5d5f311519f1fc857be24bf
font_02_sfnt_off00014ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF3 11924 bytes
SHA-256: 56311b2c784cb07ad19961ffd8220d94c315a00a81084fc4f4232b0d489171fa
font_03_sfnt_off00017809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17809 16404 bytes
SHA-256: 07516e2e4237575b7935210ff7eb0528eaec4a038c854adbad1e175189f4af72
font_04_sfnt_off00018e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E1C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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