Malicious PDF — malware analysis report

Static analysis result for SHA-256 2577a01699a4baf7…

MALICIOUS

PDF

94.8 KB Created: 2021-03-04 14:38:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ead64db384f80610de8d7cc49165a700 SHA-1: d99734185ee265c92fd2b99b97940458ea7d2487 SHA-256: 2577a01699a4baf7ab450220fa26640114ac4f7b854cb8d6c5ee9ae741fd1279
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The document body and extracted URLs indicate a lure related to 'Hamden tax collector online'. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely for phishing or redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jumiwimov.ru/wix?keyword=hamden+tax+collector+online PDF link annotation
    • https://cdn.sqhk.co/simizekovogi/Gjjicgi/vapapava.pdfIn PDF document text
    • https://biteledazuxol.weebly.com/uploads/1/3/4/3/134315761/2814068.pdfIn PDF document text
    • https://cdn.sqhk.co/rekosiseweno/cmicRia/49657986350.pdfIn PDF document text
    • https://xijeruwenuvu.weebly.com/uploads/1/3/4/0/134018409/ad88f.pdfIn PDF document text
    • https://cdn.sqhk.co/voguzasijur/ohbijha/zewobobebagi.pdfIn PDF document text
    • https://vabemeraronoj.weebly.com/uploads/1/3/1/4/131452983/bonukuzubudew.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvesanap/jdheggp/lovecraft_hbo_how_many_episodes.pdfIn PDF document text
    • https://cdn.sqhk.co/fowipovoji/dZhfT6J/rebuild_of_evangelion_1._11_stream.pdfIn PDF document text
    • https://lotinusola.weebly.com/uploads/1/3/4/3/134321880/kinix-rosuwu-mubudimajodevut.pdfIn PDF document text
    • http://debesur.iblogger.org/bbc_iplayer_using_data.pdfIn PDF document text
    • https://cdn.sqhk.co/gapebeve/hc2NjaB/epic_race_3d_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xewasejeve/9M41hsl/55953742222.pdfIn PDF document text
    • https://viwoxinuzozaxa.weebly.com/uploads/1/3/1/6/131636825/dbf403585.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/yiaZTa5/piwunupela.pdfIn PDF document text
    • https://cdn.sqhk.co/titesojijuko/dmkVhh2/zigunimaxisexube.pdfIn PDF document text
    • https://cdn.sqhk.co/mudifuto/Fnhahcc/get_off_my_planet_game.pdfIn PDF document text
    • https://cdn.sqhk.co/lexebogefaj/dNyQiiM/let_s_play_worms_wmd_2.pdfIn PDF document text
    • https://cdn.sqhk.co/jidelugob/qOBUhdo/donurogujetevuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pidosowot.epizy.com/kinitekoxoraliv.pdfIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_f61565f4fcae4b99ba7230913db83ef4.pdf?index=trueIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_ff05d54b137849989e0ea913f75f8e10.pdf?index=trueIn PDF document text
    • http://gunuguduwurenog.epizy.com/why_do_most_change_efforts_fail.pdfIn PDF document text
    • http://dinajamabas.epizy.com/29000241774.pdfIn PDF document text
    • http://kepujelibip.epizy.com/bewafa_song_pagalworld_mp4.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_off000137c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C4 4936 bytes
SHA-256: 28acead073dac37b272f970afa99921b807622f5e615839ccc2f61bff86172dd
font_01_sfnt_off00014875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14875 10904 bytes
SHA-256: 27805371db716070f991abc66fcfce66b9fc454cf361b5572cdbc6d1091e1156