Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e571c3abe2c9a9…

MALICIOUS

PDF

73.8 KB Created: 2021-03-14 17:25:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c6c2cedb76055561fd37f0fefc4810ac SHA-1: 5a8a893fc78de5317fb19df9ced59cbf7a86fcf5 SHA-256: d7e571c3abe2c9a92719fef9865606664e5cbc18acdfb755e2027b971afae6b6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a significant number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The document body is heavily obfuscated, but the presence of URLs like 'zajinet.ru/wix?keyword=www.publix.org+discount+programs' indicates a potential lure related to discount programs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/wix?keyword=www.publix.org+discount+programs PDF link annotation
    • http://ejinaya.com/3rd_grade_math_worksheet_additiond5mrd.pdfIn PDF document text
    • https://zibufiwoteder.weebly.com/uploads/1/3/4/3/134318613/mopujurawemax.pdfIn PDF document text
    • https://posoxoniboje.weebly.com/uploads/1/3/4/7/134713430/5925378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481058/normal_602f330ce5f08.pdfIn PDF document text
    • http://bristol-yalta.run/trainer_forza_horizon_4_pcjp9gu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425759/normal_5fe0e3ed8f9e2.pdfIn PDF document text
    • http://infonewsuk.site/65198779467a2yfv.pdfIn PDF document text
    • https://xitolomeka.weebly.com/uploads/1/3/4/0/134012462/5995391.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406812/normal_600174d791948.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477400/normal_604185dad5d18.pdfIn PDF document text
    • https://xorizelipuv.weebly.com/uploads/1/3/1/6/131637744/vulunavibew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451551/normal_6002f8dfb4b2e.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/466d01b5-50d3-4283-a8da-0802f02f8efc/pubajodawegevibezadunar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca813867-3d7f-4ffa-920d-8cd8f91757fc/price_of_small_generac_generator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69b326a0-0160-4593-8bbe-c2f195fa60fc/tenvis_jpt3815w-hd_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e6d03ce-a299-43e0-8db8-2738bed1d896/40664718666.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b894b472-ad07-492a-94d3-bb5da5d2138b/catherine_ponder_affirmations_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa77657b-17d4-48a2-8980-50ff4d1e0829/pre_harvest_interval.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4078571-addf-4982-96d9-7316212f4afe/83481911264.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3771b8ef-d674-44b9-9bb5-ba660a05a078/la_venganza_del_conde_de_montecristo_pelicula_completa_repelis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb0038b1-c827-4dd4-9337-961875ba473f/are_there_vr_movies_for_ps4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c355f8c6-a81f-40f0-87c1-f0c1209f209b/ninja_professional_blender_1000_replacement_blade.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_off0000e1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D5 5736 bytes
SHA-256: 4d898fb94ce303c5c7ed5441d39b7a87bf7e6716ebdb287a8bb5eab3ae3b1f26
font_01_sfnt_off0000f571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 10688 bytes
SHA-256: 64f45fae197da53fd2e84f2346b9d9956839778931f41c379ec8e1462a50fed4