Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad490d45686de343…

MALICIOUS

PDF

75.4 KB Created: 2021-03-07 16:22:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a98f9895f87345b628d9e9646be5ffae SHA-1: 5013f3861bde3c5fa7b0fb0d83d6ea129536976a SHA-256: ad490d45686de3436c2b2a0c852a91505073e500d397da2caa80a63c13b4d29c
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, with heuristics indicating it functions as a link farm. It contains numerous external URLs, many hosted on disposable domains, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of many external links points towards a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://gimoguvi.ru/wix?keyword=how+to+cook+digiorno+pizza PDF link annotation
    • http://circulyarkadigital.xyz/57716835357m6tfk.pdfIn PDF document text
    • https://cdn.sqhk.co/wanukawuwota/YkKa3wL/word_blitz_facebook_hack.pdfIn PDF document text
    • http://bcipreactivaperu.com/martin_luther_on_romans_8vfj4t.pdfIn PDF document text
    • https://cdn.sqhk.co/pugipepa/niiDwhe/csdgs_offre_d_emploi.pdfIn PDF document text
    • http://videohost.space/zajedoberexbaa8v.pdfIn PDF document text
    • http://habirovradik.ru/glencoe_math_pre_algebra_book_onlinexl06p.pdfIn PDF document text
    • http://microbestdigitalmeter.xyz/my_time_at_portia_ruinskazi3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_557fa5c5306642c58c583a5d70838071.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xakusineba/85665195453.pdfIn PDF document text
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_7f54545eedef49b39e3ae62bc6ab09ce.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vovuzize/59474594975.pdfIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_5a6957fb1be4482bad32bf5bac651896.pdf?index=trueIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_40384517ead447c9a90e8a4abe3c953a.pdf?index=trueIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_edfe86ae8dd643469560f8b64fc42929.pdf?index=trueIn PDF document text
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_9e63eb3b8279404a8d010852ff4b7d22.pdf?index=trueIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_8b1018f88a104e7d9e4885ade893d7af.pdf?index=trueIn PDF document text
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_36a881e9ce73460482af2c634f9aa85b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xipavir/93711822190.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_off0000eb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB48 5196 bytes
SHA-256: b6d30fae3c034af538896b96430c7f45ba7870911b3048c4e463a2185ee0925f
font_01_sfnt_off0000fd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD25 10196 bytes
SHA-256: d574157049057273764f42d7e851359b2200229926b363f7292be13af0095a30

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