Malicious PDF — malware analysis report

Static analysis result for SHA-256 843cdd1feb34db32…

MALICIOUS

PDF

83.6 KB Created: 2020-12-19 10:11:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 009102368219f4e9b25cfc6f6c23dae5 SHA-1: 397663461aa46c1add3e45af4a696e1f936428b8 SHA-256: 843cdd1feb34db32c2e83c7eb6aaabfb320fd087504b56480f1c6fd6cbd4b16e
304 Risk Score

Malware Insights

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

The PDF contains a high number of external links, many pointing to disposable hosting, and is flagged as a malicious redirector and credential phishing lure impersonating Instagram. The embedded URLs and the heuristic firings strongly indicate a phishing campaign designed to steal user credentials. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://samirimirusa.weebly.com/uploads/1/3/0/8/130814124/wimewunimusonereb.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.
  • 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/strik?utm_term=insect+body+parts In PDF document text
    • https://samirimirusa.weebly.com/uploads/1/3/0/8/130814124/wimewunimusonereb.pdfIn PDF document text
    • https://vobobesi.weebly.com/uploads/1/3/4/7/134702984/tatutatuzejar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465007/normal_5fcf8bac5b1e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403679/normal_5fc56d0daa5e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486983/normal_5fcced6ca10b4.pdfIn PDF document text
    • https://zukutalemuz.weebly.com/uploads/1/3/4/5/134582669/zofobuxi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412380/normal_5fcbab2a40346.pdfIn PDF document text
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/4e61c85.pdfIn PDF document text
    • https://sakukavazu.weebly.com/uploads/1/3/1/3/131379729/waxipiwazesoj.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/8fbfc375-5e32-4b8c-8b47-e5846af0df4c/44011202183.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9849b03a-fe76-43f6-bdc7-d5e8f1b6e9ef/postgresql_add_column_with_default_value.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/972e539b-3d4c-4158-89b1-3c6ffb4833c2/magistracy_of_canopus_catgirl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d0a54f9-e1e7-4509-8dc2-392f9ebc6589/ruger_blackhawk_elite_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/cerberus_pro_apk_full_cracked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44c8c3e1-6dd9-47e5-984a-52260d9231ca/kelulomeb.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB50 5216 bytes
SHA-256: 37e1087badc35a776c4cca92842ea14c909088009885e230980fc05cdceeed39
font_01_sfnt_off0000dd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD15 11740 bytes
SHA-256: 2299934f9f3884ed58f2c1e4ea9bf93cac4f7c6ec76596a33b17cb6969849261
font_02_sfnt_off0000ffb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB4 10856 bytes
SHA-256: c90b05b610c26e8aaa23463761f214b4b9a714706515f220bbc97f4725a1eabb
font_03_sfnt_off000124fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FD 18132 bytes
SHA-256: face72fb9349f2adee551edfc3a07a9150c342a95313e8f525bda1486134f366

Open this report in the interactive analyzer, or submit your own file for analysis.