Malicious PDF — malware analysis report

Static analysis result for SHA-256 3661b0f9e4b3df77…

MALICIOUS

PDF

78.0 KB Created: 2021-04-02 18:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59c30d84fc4fdac4ddaaed8d2e6ff3ee SHA-1: 51025f08acaa29cb5e0fa52d6619ee45c67bc430 SHA-256: 3661b0f9e4b3df7742ebfe920caeada2f3c2daba318da6ab13b5e936eddfbba7
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms or phishing sites, and is flagged by ML classifiers and ClamAV as malicious. The embedded URL points to a website that appears to be part of a link farm, suggesting the document's primary purpose is to redirect users to potentially malicious content or phishing pages. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/aws?utm_term=is+it+worth+getting+a+laser+printer
    • https://cdn-cms.f-static.net/uploads/4415321/normal_60601b99e1945.pdf
    • https://cdn-cms.f-static.net/uploads/4393345/normal_601580dbb3b4e.pdf
    • https://vorevowupi.weebly.com/uploads/1/3/4/6/134633589/6372133.pdf
    • https://cdn-cms.f-static.net/uploads/4486215/normal_603225e38f4fb.pdf
    • https://pibigetikuke.weebly.com/uploads/1/3/5/3/135387636/fufini_napevofupuno_legimagejep_jejuwaxu.pdf
    • https://wikaxefukefep.weebly.com/uploads/1/3/4/5/134519338/5440a8e487.pdf
    • https://static.s123-cdn-static.com/uploads/4393898/normal_5ffe8e0fc22e5.pdf
    • https://fulitadu.weebly.com/uploads/1/3/4/8/134863398/wupuditoki.pdf
    • https://static.s123-cdn-static.com/uploads/4389603/normal_5ff2bcf580ad1.pdf
    • https://static.s123-cdn-static.com/uploads/4388608/normal_5febbe8e1f858.pdf
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/0d3256604cc.pdf
    • https://gepogixuzusesil.weebly.com/uploads/1/3/3/9/133999736/zoviteluvom.pdf
    • https://tasekesin.weebly.com/uploads/1/3/2/6/132695719/zosokuxodubi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/89a8ed14-ad5f-48c7-846d-a5d36e12bec1/the_trials_of_apollo_book_5_iprivate.pdf
    • https://uploads.strikinglycdn.com/files/a6a702ae-fb4c-4b6f-9daf-91fc243abfeb/pouring_concrete_in_cold_weather_aci_306.pdf
    • https://uploads.strikinglycdn.com/files/fa93bd83-8755-41c8-a67b-dc1a294e1c0e/how_to_factory_reset_a_nexus_7_tablet.pdf
    • https://uploads.strikinglycdn.com/files/f9a44019-781b-491f-b2ca-8b1ee8f4f7f8/75232727792.pdf
    • https://uploads.strikinglycdn.com/files/c53acf31-4cd5-42ad-ae44-b1260258fa27/5_great_rivers_in_us.pdf
    • https://uploads.strikinglycdn.com/files/1caff106-3534-4dd4-bfda-c1e5b293e539/jobs_for_ba_in_english_literature.pdf
    • https://uploads.strikinglycdn.com/files/08c242ec-f529-4e2c-8c58-48d91382082e/botene.pdf
    • https://uploads.strikinglycdn.com/files/12f00a35-9c33-443e-a1b6-37bbb4c90d48/practically_cheating_statistics_handbook.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8c9.bin
d96571eb51cd7ba9f9021cb4f48b4f4698c807d66da3b36d01103c996de75b61
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 4900 bytes
font_01_sfnt_off0000f974.bin
d7b5d915afa03e7f474d499aa5434b8dc773adfcf47e777fb8744bf8959820e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF974 10124 bytes
font_02_sfnt_off00011c2e.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2E 4324 bytes