Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a1b415b636df4c…

MALICIOUS

PDF

86.6 KB Created: 2021-03-31 09:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1e7d1acff1f12c2dde11a5c987904d68 SHA-1: b19ee6b45bd5338849e7065782ac56d5565589a7 SHA-256: 76a1b415b636df4c3df90001c3e9769a98c2d0746e311f7d312aad8ee42520b5
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan delivery mechanism. The document body, though partially corrupted, suggests a lure related to an OSHA whistleblower complaint form. The presence of numerous external URLs, including suspicious ones like 'druttle.ru' and 'samo-katim.ru', points towards an attempt to redirect the user to malicious content or download further payloads. The PDF structure itself contains embedded links, further supporting the phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://druttle.ru/123?utm_term=osha+online+whistleblower+complaint+form PDF link annotation
    • http://samo-katim.ru/mr_badman_kidi_videop2wup.pdfIn PDF document text
    • http://toportt.online/call_of_duty_cold_war_beta_gameplaykbqkn.pdfIn PDF document text
    • http://beach-fruit.fun/palobesinapokopodzrbrm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450424/normal_60320f34115bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386848/normal_6054162b541bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469623/normal_60165fd24e19b.pdfIn PDF document text
    • http://vuxiparami.22web.org/zetimev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451737/normal_5ffa791768183.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459631/normal_5fcb3afda0bc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477626/normal_60514c16e3961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479906/normal_602b389091dda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421464/normal_5febf6737a766.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fibafewupo.epizy.com/free_printable_science_worksheets_magnets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcad0760-1ef4-4464-878b-3257d4c28557/28054797723.pdfIn PDF document text
    • http://jipokogave.epizy.com/3105383386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/946cc515-a65a-4927-bfb3-80622ff6d91d/which_is_the_8_limbs_of_ashtanga_yoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7331513-59ba-4108-b125-e53d3c6378d5/what_years_was_the_great_depression_in_the_usa.pdfIn PDF document text
    • http://reditavipesef.rf.gd/adblock_free_for_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4130ea7e-627c-4134-8d6a-4f3a4ecb94f2/52019140272.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4578d8a-969d-4281-93bc-369bffe302c9/is_mad_sweeney_really_dead_on_american_gods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb57ed5f-b819-4493-a806-f4d58d6ffd55/gaxurewoledevemisog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae72a76d-c580-4fe8-898c-54a22c640b66/2101986481.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1292400-bd32-4674-90db-1e4025d0b451/67928068933.pdfIn PDF document text
    • http://vuginok.epizy.com/nodesuraku.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001007a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007A 5512 bytes
SHA-256: a194e26ff3d158f2baa262b6967b97513812f2be70fd94f58fc07256a0998e14
font_01_sfnt_off00011319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11319 10524 bytes
SHA-256: d7e7f0f12b6bc3b17e085dc3e5ae4d8610c6a13fe877d289a6c2d278be66378b
font_02_sfnt_off0001372c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372C 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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