Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64063c4b10a7064…

MALICIOUS

PDF

85.1 KB Created: 2021-04-07 05:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7eaa73f9775442f558518eb58d2b67b8 SHA-1: b1c7c540f76c720f6f817304e31b9883123911e2 SHA-256: a64063c4b10a70642bbf0f01138509de395d470c21758dba19e567b0b9e5d923
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an MFA/2FA-themed 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 0.9996

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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://dugedepap.ru/strik?utm_term=2008+stock+market+crash+recovery+time PDF link annotation
    • https://cdn.sqhk.co/povewepalu/hgoid2r/noticias_alphaville_agora.pdfIn PDF document text
    • https://jeximikukadolo.weebly.com/uploads/1/3/1/6/131636734/rijaz-japavol-rabapaturorud-dijopirolo.pdfIn PDF document text
    • https://jinobodusere.weebly.com/uploads/1/3/4/7/134722577/51123d9475.pdfIn PDF document text
    • https://navubenawegef.weebly.com/uploads/1/3/4/3/134320789/digufidi_tozugad_jidimona_bikugigimod.pdfIn PDF document text
    • https://mapevitesofik.weebly.com/uploads/1/3/1/6/131606073/9467004.pdfIn PDF document text
    • https://fopizute.weebly.com/uploads/1/3/4/3/134315067/8506e1ddac1a065.pdfIn PDF document text
    • http://vamolufu.getenjoyment.net/toxalula.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/NjbghvP/94576952333.pdfIn PDF document text
    • http://gixuloponij.mygamesonline.org/biological_theories_of_depression.pdfIn PDF document text
    • https://cdn.sqhk.co/posebozej/Ygde6Jf/agonistas_beta_2_adrenergicos.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/fjahkgg/freedom_texture_mods.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/ahegfT0/tuner_fm_italian_radio_live_streaming_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/73ec1b31-fe17-40db-ac98-8068ddef04b1/92972276487.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83e61876-66d7-421a-acf1-4ad08b5d0470/strongs_concordance_219.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5897436a-b15f-4279-afe1-14a62424a87f/botezatirepaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/455f4488-9f97-4799-af97-b95feb1a2199/96208580306.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e26cbe29-dc7a-4ee5-b4cd-c65e37c871f8/what_gpa_is_required_for_cu_boulder.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/58802166064.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f414e943-a046-4fab-9884-44d53a7618f8/how_breast_milk_is_produced_in_pregnancy.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/magistrates_court_sentencing_guidelines_speeding.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/cen_tech_digital_multimeter.pdfIn PDF document text
    • http://wewamamewiler.atwebpages.com/functions_of_hr_manager.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_off000109e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E8 5604 bytes
SHA-256: fb662f05c1a767ae23bbc757cc6828272417603bfad4742da6ad13a45606873e
font_01_sfnt_off00011cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDB 12196 bytes
SHA-256: 162e11efae68e11d894983da6f6adc44f4d0e7759b1506e8aad9cce1ae2868d4