Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb6cab00a1558c8…

MALICIOUS

PDF

75.5 KB Created: 2021-03-30 13:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 09f1ec423b6e249fa509cbc7da0adc03 SHA-1: 976531095b0b14cc8478841b99812f3ad60329b7 SHA-256: 6fb6cab00a1558c829d496d2b6e23e0b2c8f15c20c4174ae9046efa7b81c387c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'Chromosomes and meiosis study guide answers'. No scripts were extracted, but the PDF structure and numerous external links point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://pelibifir.ru/wix?keyword=chromosomes+and+meiosis+study+guide+answers PDF link annotation
    • https://sorebupewuf.weebly.com/uploads/1/3/4/4/134447244/1f933.pdfIn PDF document text
    • https://foxenaduro.weebly.com/uploads/1/3/1/1/131164157/7918282.pdfIn PDF document text
    • https://fuwelobuzade.weebly.com/uploads/1/3/4/6/134649994/6e55f5c0c7115.pdfIn PDF document text
    • http://nesarose.sportsontheweb.net/nccn_acute_lymphoblastic_leukemia_guidelines.pdfIn PDF document text
    • https://pigunakates.weebly.com/uploads/1/3/4/6/134628742/xalaralew_xinoferevabij_masom_povelo.pdfIn PDF document text
    • https://zeradukiw.weebly.com/uploads/1/3/4/8/134883462/juwifoj_fizudumeveleja_ragawetegelanu.pdfIn PDF document text
    • https://zusobakarakawa.weebly.com/uploads/1/3/4/7/134752121/afaba12c9da11.pdfIn PDF document text
    • https://puxolulif.weebly.com/uploads/1/3/4/3/134356270/4966175.pdfIn PDF document text
    • https://zajebujop.weebly.com/uploads/1/3/4/9/134902249/4483852.pdfIn PDF document text
    • http://bumululoru.mywebcommunity.org/islamic_banking_in_malaysia.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://s3.amazonaws.com/mawesenasijoser/38948641749.pdfIn PDF document text
    • https://b36ad067-21ef-4b17-9055-1dfcbb3fb98c.filesusr.com/ugd/8673ad_f63aec85031748b5819bd9aef8097781.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/guxosa/does_the_ge_spacemaker_microwave_have_a_fuse.pdfIn PDF document text
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_e1976f150d5f4902952720ac67f10330.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobobowu/96195678826.pdfIn PDF document text
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_dbc1d620d336472c876e949473453019.pdf?index=trueIn PDF document text
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_79f2cda3473a49d883fe88d53df03672.pdf?index=trueIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_d64213e99446497e8ef71c835002c5f3.pdf?index=trueIn PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_9a661f767a284adc9fb05304d3b78bdd.pdf?index=trueIn PDF document text
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_99bc373f7c2249d19d07527f49fc3bf1.pdf?index=trueIn PDF document text
    • http://lodumojokexiku.onlinewebshop.net/sims_3_update_meme.pdfIn PDF document text
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_5b3771ef436f4fcea94f8b46cdb2acb3.pdf?index=trueIn 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_off0000dd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3D 5308 bytes
SHA-256: ce76a1e349b614dcb05e29b59b61f0e68613df97f3b2680c1a820597cf9c69cd
font_01_sfnt_off0000ef36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF36 10168 bytes
SHA-256: 4299de676276c5c406662849532dbc096a4c74ac44c3310c760457b49af661ef
font_02_sfnt_off000111e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E4 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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