Malicious PDF — malware analysis report

Static analysis result for SHA-256 767cc417fb149848…

MALICIOUS

PDF

67.3 KB Created: 2021-03-03 11:28:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b2d3e3999b608869d4f7dbad73f92d20 SHA-1: aabc95b0f1cf0b03c064a76f6140d54755c23948 SHA-256: 767cc417fb14984810e0270cac30560aae5878e9bafdf5b4bbfa9098b077967f
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains like Weebly, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to be a lure related to appliance repair, directing users to external 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://kuzutuzo.ru/award?keyword=kenmore+600+series+dryer+won%2527t+turn+on PDF link annotation
    • https://jiromozuno.weebly.com/uploads/1/3/5/3/135387519/fbe80.pdfIn PDF document text
    • https://xabanemexe.weebly.com/uploads/1/3/4/4/134443602/xojanufiga_lugemutuj_wegojuvikiwulo_netovod.pdfIn PDF document text
    • https://jugafuxuxeg.weebly.com/uploads/1/3/2/7/132740719/dibezasi_govutixitizus_liketilokupufo_vukejofojose.pdfIn PDF document text
    • https://gubepukabo.weebly.com/uploads/1/3/0/8/130873841/lomavelubasufe.pdfIn PDF document text
    • http://kesuvajeb.scienceontheweb.net/manual_for_canon_p170-dh_calculator.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368243/normal_60136cab09293.pdfIn PDF document text
    • https://cdn.sqhk.co/dutudovajud/jgjgOhc/fujufogedaxij.pdfIn PDF document text
    • https://bufudelazevel.weebly.com/uploads/1/3/4/7/134734798/nedevuvitebuzokoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411512/normal_5fda4fafd1ebc.pdfIn PDF document text
    • https://gajodugibo.weebly.com/uploads/1/3/4/6/134635488/866143.pdfIn PDF document text
    • http://finomimetafix.sportsontheweb.net/xuginumipuvilumeteg.pdfIn PDF document text
    • http://jugepawe.medianewsonline.com/what_makes_hair_grow_scientifically.pdfIn PDF document text
    • https://sowematawenuw.weebly.com/uploads/1/3/1/1/131164153/kobusesula.pdfIn PDF document text
    • https://sejixegagetuta.weebly.com/uploads/1/3/0/9/130969850/fagasepabanef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381105/normal_5ff4e04a51199.pdfIn PDF document text
    • http://wozupabalaviv.medianewsonline.com/49626251561.pdfIn PDF document text
    • https://jejipabiximi.weebly.com/uploads/1/3/2/7/132741556/zukafatuxowuw_sakejovaxo_nexubewexupewux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/arduino_programming_language_name.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/6928275176.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/brahm_kavach_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/can_an_elephant_gun_kill_a_bear.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_off0000cb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB86 5220 bytes
SHA-256: d103741db8f2b7fd1585b9f6b51d4e8675f4e5e56b43106d1bd4adebb6340684
font_01_sfnt_off0000dd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD55 10136 bytes
SHA-256: 060d3b703e4ef176868a3c84b663ac0f91c7fc9970ac0f4e4efb9930e170ae58

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