Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c5fbdf1adf53bb…

MALICIOUS

PDF

76.8 KB Created: 2021-06-07 15:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 673c0528f71b581dd13d0de5934d89ad SHA-1: 55b9e606d48ef5fa3e312b617da8e55b10b4ff69 SHA-256: a6c5fbdf1adf53bbf415bde2db92416fe779dff5f21632991ae39de6df00d0ea
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm. The primary URL, https://smidgel.ru/pbw?utm_term=how+to+read+navy+quotas, suggests a lure related to 'navy quotas'. The presence of a link farm and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a malicious intent, likely phishing or SEO spam. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://smidgel.ru/pbw?utm_term=how+to+read+navy+quotas PDF link annotation
    • https://wovigapugup.weebly.com/uploads/1/3/2/7/132710676/b0a2fddf33ce910.pdfIn PDF document text
    • https://sovajavab.weebly.com/uploads/1/3/4/0/134041947/cde5e8e37.pdfIn PDF document text
    • https://mizefubu.weebly.com/uploads/1/3/4/6/134637235/6161490.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497344/normal_6065986c756e2.pdfIn PDF document text
    • https://xurekibovadava.weebly.com/uploads/1/3/0/9/130969225/vatorexek_nepidumejala_pokidinufariv.pdfIn PDF document text
    • https://xevupuwikuguv.weebly.com/uploads/1/3/0/8/130814145/65f844c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485813/normal_60033d8a13062.pdfIn PDF document text
    • https://pikimekexer.weebly.com/uploads/1/3/4/5/134587048/ec4a1db65.pdfIn PDF document text
    • https://sifoginugiji.weebly.com/uploads/1/3/4/5/134588619/422a1eb8.pdfIn PDF document text
    • https://jiwedizuku.weebly.com/uploads/1/3/4/3/134310564/vijuxekuz.pdfIn PDF document text
    • https://josozigigararu.weebly.com/uploads/1/3/2/6/132681886/2053557.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/05be9464-9efe-4c1a-981c-1126cfec8dbf/xoxovaso.pdfIn PDF document text
    • http://bovojigu.pbworks.com/f/bsba_major_in_operations_and_supply_chain_management.pdfIn PDF document text
    • http://jufugoxula.pbworks.com/w/file/fetch/144622800/10987535525.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d4c1857-52d5-41b4-98c3-b5b19091f6c9/crossword_puzzle_solutions_new_york_times.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34467e00-bb31-4c3d-bbbf-f59b9c6caae6/pelisovabesoliti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d494f8d6-6fc0-4f13-8039-ea90e00257c1/webokugelaj.pdfIn PDF document text
    • http://tebejeloxid.pbworks.com/w/file/fetch/144627834/vuguzonodaxokowakovi.pdfIn PDF document text
    • http://dipazuwawex.pbworks.com/w/file/fetch/144675807/volvo_truck_engine_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de926250-8091-4d22-8332-35d41fd6abd9/autocad_3d_course_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4162b5e2-925e-46c5-a41c-756cd17c5809/62901889.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f372315-7d71-4836-a154-159fefb09d92/the_ketogenic_edge_cookbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/682d25b7-691b-48a9-8cca-6692657fa5a7/rasoledanisabuxovefiw.pdfIn PDF document text
    • http://sovafiben.pbworks.com/w/file/fetch/144539319/illusion_sa600_firmware_1.23.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21D 4964 bytes
SHA-256: 457f06d44386ca18a85a928810c90f6aea3c4d0a2848bbbee4f7f41e9e3dd956
font_01_sfnt_off0000f314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF314 10220 bytes
SHA-256: 8351a83cbec7c5450bc8c6eec97e42a7d17d1a4ffd3b7b0a753c047bf58ab6c0
font_02_sfnt_off0001162a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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