Malicious PDF — malware analysis report

Static analysis result for SHA-256 a712ca703632640b…

MALICIOUS

PDF

82.7 KB Created: 2021-05-18 07:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 20e75d548d27fc8e09ba9df883d1e2e4 SHA-1: ce5da9dd1b73b17985bf45f04a4848914a1b4eea SHA-256: a712ca703632640b81e2b71a1f7dc29f5913b176bfa1c313ceda3c1776004369
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.001 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a credential phishing lure impersonating Instagram. It contains a large number of external links, many hosted on disposable domains, directing users to potentially malicious content. The embedded URLs and the document's structure strongly suggest an attempt to trick users into visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://nowatipuzovatob.weebly.com/uploads/1/3/5/3/135397830/1846293.pdf.
  • 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/strik?utm_term=how+do+you+get+free+spins+on+coin+master+without+human+verification PDF link annotation
    • https://nowatipuzovatob.weebly.com/uploads/1/3/5/3/135397830/1846293.pdfIn PDF document text
    • https://levevuwakute.weebly.com/uploads/1/3/4/9/134904524/bimazuzajaxajebefano.pdfIn PDF document text
    • https://dunofedipusafo.weebly.com/uploads/1/3/4/4/134477286/nidedip.pdfIn PDF document text
    • https://mudulavodeg.weebly.com/uploads/1/3/1/0/131070753/e9c9afc139.pdfIn PDF document text
    • https://jipidonano.weebly.com/uploads/1/3/4/3/134340070/2630928.pdfIn PDF document text
    • https://dadopulemuxujew.weebly.com/uploads/1/3/4/3/134375911/lorotul.pdfIn PDF document text
    • https://bigorofepomibed.weebly.com/uploads/1/3/4/4/134400252/950630.pdfIn PDF document text
    • https://gozopurejogutix.weebly.com/uploads/1/3/4/5/134578339/sepap.pdfIn PDF document text
    • https://besajiti.weebly.com/uploads/1/3/1/8/131856076/gurusubowize_nakabem_voxob_pumapuvaxaweti.pdfIn PDF document text
    • https://zotapuzuvekef.weebly.com/uploads/1/3/4/3/134323554/a4145832dc4.pdfIn PDF document text
    • https://giburonolunege.weebly.com/uploads/1/3/1/4/131406036/d578579ee.pdfIn PDF document text
    • https://jozifopavix.weebly.com/uploads/1/3/4/3/134355896/pofuxagabesif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/05abc0a4-dfa6-4bdd-898e-28164165acd6/4887180052.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/wuziwitewedulasaget.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/civil_engineering_bookss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0d4f75a-61b0-4bb1-b099-c747ed009725/james_patterson_alex_cross_movies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fd10e29-55db-48ab-8b76-1479935c35c0/42217973326.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/navebisinusojanegig.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_off0001037d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037D 5752 bytes
SHA-256: 8a0238d9d39e5c9467c65a7f410e4f0d0ec556c57b706799f5504a42b5d071a2
font_01_sfnt_off00011709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11709 10544 bytes
SHA-256: f1e63e8c0c96e5d9df58ceaba15d850ff9472bef74e54303c43400cf3031e562