Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac383761b1cfd376…

MALICIOUS

PDF

69.1 KB Created: 2021-03-18 23:48:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7e5c26fcf021e390c9dc35a6e1334975 SHA-1: b1b9eeff3ba47c491583b0ba06453e9472618d61 SHA-256: ac383761b1cfd3764922838d5e08bfe6d2c4984017a4200f87c26c9970fca58e
176 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://fokemale.ru/wix?keyword=central+loan+administration+payment+address PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4407729/normal_5fe50dc48cea1.pdfIn PDF document text
    • http://vozobatenaw.mywebcommunity.org/tipos_de_temperamentos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447097/normal_5fff29fcd9a0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472186/normal_604ac7df33a51.pdfIn PDF document text
    • https://cdn.sqhk.co/texivewa/hjjggfX/idle_monster_td_strategy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471275/normal_5fe5ea94a8eed.pdfIn PDF document text
    • https://cdn.sqhk.co/degixodip/dB9hbif/oscar_health_insurance_reviews_nyc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451045/normal_5fcb740b88cd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391327/normal_5fdc65d95a92c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450438/normal_5fd89c2e8b906.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392862/normal_5fdebd7c1a1fa.pdfIn PDF document text
    • http://tazanup.mypressonline.com/gotaxokiruf.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/iars3ee/vigaretekutuvojobut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://71a5d838-4e22-4830-8da1-7955ec3365f5.filesusr.com/ugd/f2f43e_d4922e6ff6504b6b9a987a7628792209.pdf?index=trueIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_f88b004bcf59447f8a427929c45ea4f4.pdf?index=trueIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_5f13448288d74377960405b0dc9b7a56.pdf?index=trueIn PDF document text
    • http://junimufik.epizy.com/74771861349.pdfIn PDF document text
    • http://pekuvem.epizy.com/bukiropadutozamubosuto.pdfIn PDF document text
    • http://podisibasozo.rf.gd/mabotuzipivaminuvadokoj.pdfIn PDF document text
    • http://rubuvajaroxe.epizy.com/template_ppt_tumblr_free.pdfIn PDF document text
    • http://runexodaluxova.epizy.com/78705664119.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D0 5112 bytes
SHA-256: e17e33b5fde4b4ea62c918053644e1f938122fad017e0efc177cc7285557e57b
font_01_sfnt_off0000e323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE323 10356 bytes
SHA-256: cfc074c54ded8ce0a9b7af74ad0476f4a82e160988920b417576280428418653

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