Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3402463d08eaf3…

MALICIOUS

PDF

72.7 KB Created: 2021-06-02 16:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b35c3c0f0c245c003d61c010cebc2a6a SHA-1: 58aaffacfcd32bea01654a69b3df9f3e4d08c4e9 SHA-256: 3f3402463d08eaf3fe9de6e35b10579c0b3b83d75c3d7f19d2a2dc2cf8c21e55
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 5

  • 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 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://cructi.ru/pbw?utm_term=how+to+activate+function+keys+without+fn PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454172/normal_5fd0703061142.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413982/normal_5fcf52b94449a.pdfIn PDF document text
    • https://bazojosazim.weebly.com/uploads/1/3/6/0/136086377/kodumigesufufaz-pegadusigaruv-poratu-wuzogadulil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477892/normal_60355a74cfb80.pdfIn PDF document text
    • https://widawukilifuduz.weebly.com/uploads/1/3/5/3/135398171/3326261.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404313/normal_5fcbdc350948e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482191/normal_604db4f0881dc.pdfIn PDF document text
    • https://lijixavin.weebly.com/uploads/1/3/4/5/134598275/zevikap-bezoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390329/normal_605d0c8d1db58.pdfIn PDF document text
    • https://jokazetesolibut.weebly.com/uploads/1/3/5/3/135314514/dikezobeviru-sepav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408586/normal_5fd9c16d2a2f5.pdfIn PDF document text
    • https://zufitamel.weebly.com/uploads/1/3/5/3/135349526/jebekoginurow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tusoxefum.pbworks.com/f/bollywood_old_movies_300mb_free_download.pdfIn PDF document text
    • http://vifogajo.pbworks.com/w/file/fetch/144497013/would_rather_had_better_exercises.pdfIn PDF document text
    • http://kapetipubi.pbworks.com/f/gifford-mcmahon_gm_cryocoolers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c581e6f4-42c9-4a96-ac5e-7eb9f099b788/qsc_touchmix_8_for_sale.pdfIn PDF document text
    • http://pijipusap.pbworks.com/f/jimumigibul.pdfIn PDF document text
    • http://xuresasadox.pbworks.com/w/file/fetch/144459327/72565206522.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b318b8b2-4ae5-47b8-a030-c0238b1d8138/sony_icd_px333.pdfIn PDF document text
    • http://joxupakager.pbworks.com/w/file/fetch/144490089/toastmaster_air_fryer_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50320ac7-b554-4b3a-a5f9-02176aa4d7cb/how_can_you_make_lactic_acid_bacteria_at_home.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_off0000dedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDC 5120 bytes
SHA-256: dade2662a2733091c624f16b6e35e24bb8110f242a00ce8a364438bd441dee94
font_01_sfnt_off0000f070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF070 10676 bytes
SHA-256: 3f3806c94e03dbae820e615b62316fcc933d2f138ec4dfba7b44989f3370e8cd

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