Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf2f17999da7adb…

MALICIOUS

PDF

77.8 KB Created: 2021-03-08 10:11:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 89ef59971f1969324c9d5aeb9da273a0 SHA-1: 18e75d7e9b26df0db7e985e1ddefc4b92a57eb89 SHA-256: 0bf2f17999da7adb52ba23bf2c8e8328fc69b3cc19a2cebe24961a98340dc101
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain that appears to be a keyword-driven link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://soxebez.ru/wb?keyword=magnavox%2032%20inch%20smart%20tv%20reviews PDF link annotation
    • https://cdn.sqhk.co/ziveluki/ahhPjgW/crash_car_pc_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416302/normal_5febe67254fbc.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimijexap/3jfiart/bandai_namco_holdings_stock_price.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416304/normal_5fee985da33e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409403/normal_602bd9f97f1b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485943/normal_5fd1ec17c6ee3.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/p1piahe/5010448979.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421038/normal_5ffbde4a6b2c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366381/normal_5feee5b0c4ca9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475209/normal_5fe8b4d72a0b4.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/jawagcp/93953444783.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_5269f5be3a9f446bac1d89488b338f29.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e4b6979-dad2-4cd9-9b46-3612cce29532/how_to_pair_a_vizio_subwoofer.pdfIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_e4544052fce541c4b579b5bf1ecdff4c.pdf?index=trueIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_37b7db85ee41455c8ca38db912c094f3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/jingle_bells_violin_sheet_music.pdfIn PDF document text
    • https://64395af2-4242-4e05-b369-c5cd74cd0025.filesusr.com/ugd/be19e1_7c90c4ae4d0a45ca97e99738fcf2933a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/03fed9cc-3345-4dac-b03a-d3870d161230/baby_girl_newborn_outfits_floral.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/xixixe.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/how_to_use_stanley_fatmax_level.pdfIn PDF document text
    • https://93114ef4-bbe1-4cbc-9077-193f0e57bd61.filesusr.com/ugd/b0b521_3615754fa1b1446594481ca2812a52f8.pdf?index=trueIn 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_off0000f260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF260 5704 bytes
SHA-256: 8a07f403e8b248b6260ffa6d41f0dd81fb06b822d9ab21449e33d1a48c891aeb
font_01_sfnt_off000105c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C7 10580 bytes
SHA-256: 332a21cca9632d29158f611573be027c855db2eaa05d82c1367701d55cf52afb

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