Malicious PDF — malware analysis report

Static analysis result for SHA-256 67860a8a91a31d02…

MALICIOUS

PDF

67.9 KB Created: 2021-02-15 04:35:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0da7e5ac590721d2d582979723e4b8d7 SHA-1: d89f3138cb53640d7724453ad0fc97e803d56739 SHA-256: 67860a8a91a31d027339cbfe880fa9258ca0f888a2e1665a3c1cb343be9f0ed1
226 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jottigo.ru/123?utm_term=slocum+a.+h.+precision+machine+design+pdf PDF link annotation
    • http://fomuvegikutidob.iblogger.org/gradle_test_report_empty.pdfIn PDF document text
    • https://kajagopop.weebly.com/uploads/1/3/4/7/134729443/4e679bc2.pdfIn PDF document text
    • https://gobebirerelimi.weebly.com/uploads/1/3/4/6/134651667/f5110e.pdfIn PDF document text
    • https://cdn.sqhk.co/sidamebo/rWhiiQJ/dead_zombie_sniper_assassin_shooter_3d.pdfIn PDF document text
    • https://cdn.sqhk.co/gawukale/3jdhfOK/21474475221.pdfIn PDF document text
    • https://leluwimatuw.weebly.com/uploads/1/3/0/9/130969986/2088085.pdfIn PDF document text
    • https://volorizog.weebly.com/uploads/1/3/1/0/131070051/wiweluxomibuwadibevo.pdfIn PDF document text
    • https://cdn.sqhk.co/fusajovogi/Njgihhe/love_letters_kc_promo_code.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/ZShdjfJ/octopus_is_a_squid.pdfIn PDF document text
    • https://cdn.sqhk.co/potebuso/aVCijts/spin_the_wheel_game_show.pdfIn PDF document text
    • https://fakazurirogedim.weebly.com/uploads/1/3/4/7/134743668/kunijewazix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gilasorizarer.rf.gd/11785262730.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/bulk_density_calculation.pdfIn PDF document text
    • http://levewome.epizy.com/descriptive_essay_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/kubetejezexokofodolugezut.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_off0000cb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB36 5704 bytes
SHA-256: e7d54bb932866ce627c20dfd229f554cdc0079f138e93ea4f3555009349a0009
font_01_sfnt_off0000de71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE71 10708 bytes
SHA-256: ee238850c284b7c2dceda748598c99f93b9b441a8a7325a8cf237d28408040e9

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