Malicious PDF — malware analysis report

Static analysis result for SHA-256 f59cfad76dc097b8…

MALICIOUS

PDF

72.7 KB Created: 2021-03-12 16:31:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a3c6bdf565f478a9035c5fdd13eed50c SHA-1: ab33636d7325467d08152d578bb650ded21d3d42 SHA-256: f59cfad76dc097b8b8f543b7da77e7eb30c6d219a87afe395f5c4909051c7984
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, many hosted on disposable domains, suggesting a phishing or SEO spam campaign. The document body, though heavily obfuscated, contains metadata related to 'Rotator cuff injury treatment guidelines', likely a lure to attract clicks to the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/123?utm_term=rotator+cuff+injury+treatment+guidelines PDF link annotation
    • https://zesaxigupube.weebly.com/uploads/1/3/4/0/134016892/aec5c10.pdfIn PDF document text
    • https://sazoxizifa.weebly.com/uploads/1/3/4/5/134505384/ef0686fa27267.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/b2G00qV/pekod.pdfIn PDF document text
    • https://tupirusu.weebly.com/uploads/1/3/4/7/134702138/9045636.pdfIn PDF document text
    • http://felidefewipikig.22web.org/ribozivur.pdfIn PDF document text
    • https://sidunijutama.weebly.com/uploads/1/3/1/1/131163786/73efc0c556c81.pdfIn PDF document text
    • https://cdn.sqhk.co/javufikari/RQiCCOx/siren_head_vs_cartoon_cat_rap_battle_reaction.pdfIn PDF document text
    • https://bojifigo.weebly.com/uploads/1/3/4/8/134847606/dapurovum.pdfIn PDF document text
    • https://tugufotekaluxaz.weebly.com/uploads/1/3/4/8/134883762/9955768.pdfIn PDF document text
    • https://natapoja.weebly.com/uploads/1/3/0/8/130813782/5966c3fc0.pdfIn PDF document text
    • https://cdn.sqhk.co/vaminika/9lOEhcy/bimibokasuwe.pdfIn PDF document text
    • https://zaporori.weebly.com/uploads/1/3/4/1/134131460/dd590e2c5e.pdfIn PDF document text
    • https://kixuvatapowow.weebly.com/uploads/1/3/1/3/131383305/vizezunopuguxe_zutaveba_vogezeratunira_vofujifoxavo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/pazejogukuvifixogu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfa64f7a-c907-40fd-84ed-944863cab1a1/48015490589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59bbaa79-8d77-4fa7-86a3-4d249261fab5/53102243661.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/how_to_make_easy_ribbon_bows_for_gifts.pdfIn PDF document text
    • http://rokodejufoda.rf.gd/avira_android_apk_full.pdfIn PDF document text
    • http://nolonogatifotop.epizy.com/chemquest_19_ionic_bonding_practice_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/5th_wave_book_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/62165346227.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_off0000e038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE038 5524 bytes
SHA-256: 7b4a575ffcdd1dd02a8deb794a57dd682e919f0291ce211e0998dd274f5f010c
font_01_sfnt_off0000f306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF306 10080 bytes
SHA-256: 4e3ce3c24b1fbac59a3cfb46d4994ac59e83940d209517bec01a1b4fc795cad4

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