Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b11c391d0f46bd…

MALICIOUS

PDF

82.0 KB Created: 2021-03-23 04:01:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8edaa83ba43cbb5f085288685a9739a4 SHA-1: 7da96f22efc9f44e29bc713dd96180faaab5c834 SHA-256: a9b11c391d0f46bda7d5c1fc388e0dba30a8101126a565da808cf5f8ee61ed34
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary malicious URL being lozipotod.ru. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/123?utm_term=curriculum+guide+in+english+9
    • https://cdn.sqhk.co/zenetofuma/S4yJS8V/rapujozikiduvovedazutu.pdf
    • https://zadobezaja.weebly.com/uploads/1/3/0/7/130775221/mutigu-wipafakafi-kowuj-vegifo.pdf
    • http://upsbox.ru/motorola_g6_play_indigo_revieww5mhi.pdf
    • https://dilozerekake.weebly.com/uploads/1/3/1/4/131452754/kewutogibo.pdf
    • https://puwirobazavuwo.weebly.com/uploads/1/3/1/4/131453501/94d5d5c.pdf
    • https://gavuwexis.weebly.com/uploads/1/3/4/7/134772394/saxesalugajija.pdf
    • https://muverope.weebly.com/uploads/1/3/0/7/130776407/7733410.pdf
    • http://krym.today/mizexadiwosonbs5nd.pdf
    • https://cdn.sqhk.co/napumefu/hKqgjgc/white_cheetah_running_shoes_adidas.pdf
    • https://cdn.sqhk.co/rolileduvof/igjfhjH/17572762645.pdf
    • https://cdn.sqhk.co/bitaxukezor/jhcLieF/lidoxelaxepunepiw.pdf
    • https://nusubilumib.weebly.com/uploads/1/3/5/3/135347333/d45a3.pdf
    • https://givifajilodox.weebly.com/uploads/1/3/0/8/130874655/jefuxafunit.pdf
    • https://cdn.sqhk.co/sevilebup/oWAPiia/word_farm_cross_mod_apk.pdf
    • https://pofexetebi.weebly.com/uploads/1/3/4/5/134592759/visivadematade-fumazuwo-makogawaxeli.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/vavale/57822993950.pdf
    • https://s3.amazonaws.com/leteraxewe/katokuxe.pdf
    • https://s3.amazonaws.com/potofaw/debtors_ageing_report_in_excel_format.pdf
    • https://s3.amazonaws.com/zifozujiwi/vonuxesagebopeb.pdf
    • https://s3.amazonaws.com/bulalowisu/63400565248.pdf
    • https://s3.amazonaws.com/pizivurapab/remember_me_coco_flute_sheet_music.pdf
    • https://s3.amazonaws.com/libeganot/68574732266.pdf
    • https://s3.amazonaws.com/padadutiseni/88731564494.pdf
    • https://s3.amazonaws.com/ganubifirigevi/cellulose_debris_termite_report.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f630.bin
10b9be1a9b41bb1ad112cf25cd4789c88f982816c9d4599d061af50d7fb94330
pdf-font-stream PDF embedded font (sfnt) at offset 0xF630 5016 bytes
font_01_sfnt_off000106f9.bin
e694131e727911870e923311472952091d73f6affc88f3543349e06d386ddaf5
pdf-font-stream PDF embedded font (sfnt) at offset 0x106F9 10852 bytes
font_02_sfnt_off00012c07.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C07 4324 bytes