Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42564b603e8af74…

MALICIOUS

PDF

84.4 KB Created: 2021-03-13 19:31:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 29c5efc6ea3afdf959dd522e056e29f1 SHA-1: 9e3e543dd200c3957057b8d7a0eebd1bf437b5b6 SHA-256: b42564b603e8af747a13a919ff1a61b18fdeb696afdf4b8ea4cb772595270572
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The primary function appears to be a link farm, containing numerous external URLs pointing to other PDF documents hosted on various domains. This technique is often used for SEO manipulation or to distribute further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/award?keyword=3d+printing+technology+seminar+report+pdf PDF link annotation
    • https://zuriloteva.weebly.com/uploads/1/3/4/6/134623588/c05253a673744f3.pdfIn PDF document text
    • https://pakoverixofe.weebly.com/uploads/1/3/4/7/134771358/19e6be4b66f7f.pdfIn PDF document text
    • https://vuzitiruf.weebly.com/uploads/1/3/2/8/132814505/2809303.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384633/normal_5fd660c10650f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475861/normal_6011605d60e4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366947/normal_5fc93cb5d3725.pdfIn PDF document text
    • http://begemotiks.fun/50870505538z2bn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408476/normal_6007bbc052afc.pdfIn PDF document text
    • https://vakugisup.weebly.com/uploads/1/3/0/7/130739558/c76de73d2bd361.pdfIn PDF document text
    • http://aarbuz.space/donekuk7wxpg.pdfIn PDF document text
    • http://jirafka.space/sotijepepajidejupaficp43z.pdfIn PDF document text
    • https://zifaxigelu.weebly.com/uploads/1/3/4/7/134720210/jidafol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405930/normal_6044698007d8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376875/normal_5fcb25633b859.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385852/normal_5ff61350b4318.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482415/normal_6038ee7be1ddb.pdfIn PDF document text
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/zutagosotanonuv.pdfIn PDF document text
    • https://zemapefim.weebly.com/uploads/1/3/4/4/134485651/judene-numejef-miwoponopanufe.pdfIn PDF document text
    • http://thiswaytovogue.com/beeruva_telugu_movie_songs_free64o9v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451555/normal_60450b5e37351.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mubadel.epizy.com/arcane_legends_mod_apk_2._4._2.pdfIn PDF document text
    • http://dujefukuboxus.epizy.com/96799189658.pdfIn PDF document text
    • http://mezoninol.epizy.com/lab_safety_manual.pdfIn PDF document text
    • http://vizepojuduw.rf.gd/51830822138.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_off0001092c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092C 5740 bytes
SHA-256: ce29cdcf099d3b2a84ba2864ef08b547d9f8556959c5f5db23d174627e1a9ed0
font_01_sfnt_off00011c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C96 11036 bytes
SHA-256: 413daf156c28924627fe319a2aa80c260408bfc2deb219ae97502d8b68b3e708