Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f3715a87b2bd85…

MALICIOUS

PDF

76.0 KB Created: 2021-03-20 11:01:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: efbb7af5a15cd8582df862187ab5dcf4 SHA-1: ab28bee139e944ae0b5aa491d7f18a9ed0ead71b SHA-256: a6f3715a87b2bd85f921ef53cc5e6b86e383631fc832733c65943af1066c5ed1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO abuse. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and link farm behavior suggest it's designed to lead users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/wix?keyword=holiday+time+christmas+tree+6.5+ft PDF link annotation
    • https://pafolerasakuj.weebly.com/uploads/1/3/1/4/131438226/00ab77342ca8c1e.pdfIn PDF document text
    • https://xobisajak.weebly.com/uploads/1/3/4/2/134234638/deguvovibifanox-sifoniguk-xipujuzaw.pdfIn PDF document text
    • https://gagebenejiv.weebly.com/uploads/1/3/0/7/130740087/nodawobinejuloju.pdfIn PDF document text
    • http://gosologesegob.iblogger.org/martial_artist_stretch_routine.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gozipoxux.rf.gd/lagu_chewing_gum_nct_dream_uyeshare.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/tezodisajotazugekixu.pdfIn PDF document text
    • http://fenigubigona.epizy.com/flachau_austria_snow_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c03b08f2-3b3a-47a1-97c4-678bb7435c99/all_clad_slow_cooker_not_turning_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1371a25c-42be-4faa-bf31-bb545f17b4f2/woruxisapopewanisuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa656e17-0eb7-4b62-b742-d427798e9083/xuzonuvivojukijokasoduluz.pdfIn PDF document text
    • http://telebil.rf.gd/aconex_api.pdfIn PDF document text
    • http://wivonubezur.epizy.com/form_centre_css.pdfIn PDF document text
    • http://judutuv.epizy.com/how_to_hook_up_rca_surround_sound_to_lg_tv.pdfIn PDF document text
    • https://63d876aa-455f-4c41-9c38-50747f3e0b95.filesusr.com/ugd/a220d5_526edad116ed484a831b76096d4de3e0.pdf?index=trueIn PDF document text
    • http://rinexevijexaxi.epizy.com/tudafijamadunatokek.pdfIn PDF document text
    • https://6c9aa500-f8d9-42a6-b8a4-5b3c562bbfc3.filesusr.com/ugd/543886_2aea6277b463480db39f2dfce0942dcc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d7364ce-281f-4027-88d1-6270265bc876/bebelaseduzuleramu.pdfIn PDF document text
    • https://84bd2c60-91d0-47b6-9565-6ae8a6593e58.filesusr.com/ugd/963627_e5712c47a0a54733a42f70a85bbaedb3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e661df90-5f1b-49fa-a528-bb9c7f8b5204/ponugawajopisitowovadu.pdfIn PDF document text
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_dab6c88a76e348d18392cf323082a3f4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvarelo/xubaxebagopeporitora.pdfIn PDF document text
    • http://petilawunabebi.epizy.com/faxowudizusizaz.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_off0000e930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE930 5632 bytes
SHA-256: f2e7ff7641206d26c70bd94b6c61432fa2a4d59d1281a874d6e7ff542dad98a9
font_01_sfnt_off0000fc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3B 11404 bytes
SHA-256: cd17659ea092b9a340ad94de49666a7f828c7fa6f3845b496975e40605112675