Malicious PDF — malware analysis report

Static analysis result for SHA-256 d811da8ea6271ee1…

MALICIOUS

PDF

75.5 KB Created: 2021-02-27 06:42:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 90abc0e5073a35feea9d8f17550e5afd SHA-1: 1120b3e2312fd984847e9b81afbcb5297c9092ee SHA-256: d811da8ea6271ee1a20e446047af3b468c097a3f74de5afb5626dab2c4f5d372
194 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. The document body, though heavily obfuscated, appears to contain a lure related to Samsung ice makers, suggesting a phishing or scam pretext. The embedded links likely lead to further malicious content or ad-revenue generating pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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://midufefew.ru/aws?utm_term=why+does+my+samsung+ice+maker+not+work PDF link annotation
    • https://cdn.sqhk.co/butemobe/gjdie0n/crane_rail_autocad_drawings.pdfIn PDF document text
    • https://cdn.sqhk.co/guvawatuzax/In8ShcA/66068613360.pdfIn PDF document text
    • https://ropugobefele.weebly.com/uploads/1/3/4/4/134445072/3999638.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluxoni/hZlXigg/best_size_tile_for_small_bathroom_shower.pdfIn PDF document text
    • https://nisaxiguxizi.weebly.com/uploads/1/3/5/3/135306566/5ef800a6.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/2hcrUjf/did_you_know_facts_about_green_anacondas.pdfIn PDF document text
    • https://cdn.sqhk.co/muribirigim/4jetuje/car_loan_calculator_pakistan_meezan_bank.pdfIn PDF document text
    • https://cdn.sqhk.co/tamurikubol/dAjcwie/1204109862.pdfIn PDF document text
    • https://jijajaxasivezix.weebly.com/uploads/1/3/4/5/134588510/biwumam.pdfIn PDF document text
    • https://manoduxasef.weebly.com/uploads/1/3/4/0/134041035/lilunoxo_sutagagilidaga_nulasosifixutez_movatik.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvazuginu/ehcigib/gamefly_customer_service_hours.pdfIn PDF document text
    • https://cdn.sqhk.co/pijajawopoji/jhljeci/12405692532.pdfIn PDF document text
    • https://vulagikivup.weebly.com/uploads/1/3/4/2/134234906/bemibokuf.pdfIn PDF document text
    • https://bukenazupe.weebly.com/uploads/1/3/4/5/134584610/vulojeguroxomi.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/tokatefozude/palutawalotisujuminom.pdfIn PDF document text
    • http://gotupodejepu.rf.gd/61534419329.pdfIn PDF document text
    • http://tugepujato.rf.gd/cake_maker_game_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/leopard_gecko_care_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/51479441863.pdfIn PDF document text
    • http://ronapidilejok.rf.gd/46852591561.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_off0000e97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 5592 bytes
SHA-256: d7233933cd4fd72c3b3420eb93c578dd1b6beb1e21e524377ed0ac23f5e1d26f
font_01_sfnt_off0000fc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC74 10516 bytes
SHA-256: fee27b47576153153928774dc79c42077121ce8e95bc492920c7d4dca1e1b673

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