Malicious PDF — malware analysis report

Static analysis result for SHA-256 519b1bed43e561e6…

MALICIOUS

PDF

74.7 KB Created: 2021-01-04 01:46:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 00e740acca12d70325dd71fd7f43db8b SHA-1: fb33626f435d34abd608f0422f03fa7aa52f6707 SHA-256: 519b1bed43e561e69a584749722ac2a3984f6637f60a048f53396dabcbb498d8
314 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains heuristics indicating it is a malicious redirector and a brand-impersonation credential phishing lure for Gmail. It also includes a large number of external PDF links, suggesting a link farm or SEO abuse. The embedded URLs point to known malicious infrastructure, likely intended to lead the user to a credential harvesting page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://semovililuf.weebly.com/uploads/1/3/4/4/134476677/c2624b3deee39ec.pdf.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://ggtraff.ru/wb?keyword=gmail%20sign%20up%20new%20email%20id In PDF document text
    • https://cdn.sqhk.co/digiwejasipu/jLhi75C/59973170390.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455396/normal_5fec47ce87b21.pdfIn PDF document text
    • https://semovililuf.weebly.com/uploads/1/3/4/4/134476677/c2624b3deee39ec.pdfIn PDF document text
    • https://kekoweditolig.weebly.com/uploads/1/3/2/6/132683085/kulujine-nakesibe.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/bb03721a-84f0-498d-b404-4225f6618bad/55483410973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/196549db-d112-4a68-91c3-36030a17db07/duludirila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b68e7d88-68e3-4f66-af8a-b8fd793f4593/bear_outbreak_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd14afea-c2c9-4be6-a8e8-0cbec1ad12d3/66397691909.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/naboderezaxigetenil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e4db69a-7e73-4e77-babe-962ecadd1989/versus_fight_ccg_brawl_mod_4._17.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9baa29de-fdb2-45ec-922e-65097bfcf666/pulse_pressure_calculator_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd41f786-a578-4167-af25-4ce7baadba2b/90977332178.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_off0000e5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C8 5308 bytes
SHA-256: 9e259f811acef1203469163ee46dc70139eaa4e3faf0e54ef02cbe5280d163b2
font_01_sfnt_off0000f7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D7 11260 bytes
SHA-256: 3c588bd9bd535db87386ec379eb42e68bb4cc3642bf2f388b83487417e47a829

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