Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ff1065d2f72609…

MALICIOUS

PDF

64.7 KB Created: 2021-02-20 17:40:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6fcf5f68204936cb1d915ee8a881cd13 SHA-1: 52a398bb2f8a69e591468aa75071421dddd9e114 SHA-256: 70ff1065d2f726093e60e8a24179ea2dde9f9e882af6c176da4cb591c240a264
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to a pediatrician search, likely a lure to disguise the malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=dr+nelson+pediatrician+richmond+va PDF link annotation
    • http://pasetbs.xyz/55225688100156rc.pdfIn PDF document text
    • https://cdn.sqhk.co/patagarinixa/ggigcA3/kingdom_of_procreation_2_apk.pdfIn PDF document text
    • https://masonijajalef.weebly.com/uploads/1/3/4/7/134708569/besibolulufalabe.pdfIn PDF document text
    • http://tendernes.ru/1092851267869t68.pdfIn PDF document text
    • https://monoxoni.weebly.com/uploads/1/3/0/7/130738852/3947308.pdfIn PDF document text
    • https://riluvozig.weebly.com/uploads/1/3/4/3/134380056/4043091.pdfIn PDF document text
    • https://cdn.sqhk.co/resesexiraf/38jghiv/john_gba_lite_emulator_pokemon_emerald_cheats.pdfIn PDF document text
    • http://milanomoda-italy.website/knife_master_vs_roguej97vq.pdfIn PDF document text
    • https://poxovoxi.weebly.com/uploads/1/3/5/3/135398301/nirenafojag.pdfIn PDF document text
    • https://walazufa.weebly.com/uploads/1/3/1/3/131383665/6be26899689.pdfIn PDF document text
    • https://cdn.sqhk.co/zutijujes/guIkmgh/lofot.pdfIn PDF document text
    • http://dhl-order.info/66688243376bd5w5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rasunafosav.epizy.com/luvuvokopebomemuxuz.pdfIn PDF document text
    • http://kedaxesipuwid.epizy.com/les_appareillage_electrique.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_off0000c08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC08B 5372 bytes
SHA-256: cbecb81209e0b31fb470fd101e7fd1c57b59cace116a295dda8ec6462b44e4e5
font_01_sfnt_off0000d2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AF 10324 bytes
SHA-256: 709a0cb2c95ce76dc67336c415c92dbf32936760d137b005b3cd8fa40ad20e19

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