Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e27b476cf846c1…

MALICIOUS

PDF

76.1 KB Created: 2021-04-11 05:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 898afdcecf8b40d05142c5d1d1e35aca SHA-1: 2ab2cf8a0c1d1d9be0dc41b27fc883cc59aecef4 SHA-256: 50e27b476cf846c19b924498a0d5cde0dba6706e81009f7bede5457f03cfc15a
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/strik?utm_term=clover+water+cooler+manual PDF link annotation
    • https://wugowimuvup.weebly.com/uploads/1/3/4/7/134762233/d572156e85bf.pdfIn PDF document text
    • https://rizogogitire.weebly.com/uploads/1/3/5/3/135323834/2576477.pdfIn PDF document text
    • https://ripukalogud.weebly.com/uploads/1/3/4/3/134391837/8424844.pdfIn PDF document text
    • http://dostafood.xyz/caller_id_faker_unlimited_credits_apudwav.pdfIn PDF document text
    • http://fb-ig-violation.com/7391337514028z5o.pdfIn PDF document text
    • http://byseles.xyz/40951092473lkum0.pdfIn PDF document text
    • http://zerkalo-fugicar.website/paisseur_de_trait_autocadwzzks.pdfIn PDF document text
    • http://clobuss.ru/17352258090un9sf.pdfIn PDF document text
    • http://gachihyper.xyz/xidawurevx90ma.pdfIn PDF document text
    • http://demask.space/fogufawzhxem.pdfIn PDF document text
    • http://sreda.city/the_little_match_girlqys0i.pdfIn PDF document text
    • http://edayafar.xyz/tibivoporegurutisademaumr.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://31e64076-56b3-4e53-9780-179364fbad2f.filesusr.com/ugd/d8d3cb_4f226752db644c77860236eb5bf3b206.pdf?index=trueIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_a78e492372644440b0a84dcfab4ba9ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/capability_curve_of_synchronous_generator.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/bastard_s_tale_trophy_guide.pdfIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_a7fabb581eb84202bb3c3a08b2bc9942.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/colonoscopy_after_diverticulitis_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/flight_simulator_xbox_one_gameplay.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_off0000ec36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC36 4824 bytes
SHA-256: 1eedf6b969425c22af0e5380305b5e285b3a6ce408dafaaaada27a1e86a95e9b
font_01_sfnt_off0000fc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC97 11484 bytes
SHA-256: 8024c2165656732a413f1bb552faa0db5af1638e4c3369a4af79ced8449d5c80

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