Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca39a9680f6a13d…

MALICIOUS

PDF

75.1 KB Created: 2021-02-14 16:51:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e9555c47c6467140fd4b30279dd01a24 SHA-1: 705ede2e818e8d62c11aaa7cf5fdf3cbbb3fbd35 SHA-256: bca39a9680f6a13d38bfce8704eb4703166f7af2219ad6488922945ecf1ff522
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. While no scripts were extracted, the structure and numerous external links suggest an intent to redirect users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=summit+make+no+small+plans PDF link annotation
    • http://ledimpress.biz/62458830023rx1vh.pdfIn PDF document text
    • https://cdn.sqhk.co/xoberuweri/jhfQPfm/write_notepads_review.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/gggghiA/amazon_echo_show_10_stand.pdfIn PDF document text
    • https://puwevifu.weebly.com/uploads/1/3/4/4/134465284/tukinexijivozatevi.pdfIn PDF document text
    • https://cdn.sqhk.co/molavagew/1jbddhi/nasa_tracks_asteroid_2020_november.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/1geibii/recharge_pcs_mastercard_belgique.pdfIn PDF document text
    • https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/jevasuki.pdfIn PDF document text
    • https://dopovubejaxow.weebly.com/uploads/1/3/4/0/134017692/kadaxewid-losod.pdfIn PDF document text
    • https://cdn.sqhk.co/kixikeli/mhdbDnA/34562111056.pdfIn PDF document text
    • https://cdn.sqhk.co/xenudipu/eihCUhb/police_officer_jobs_in_killeen_texas.pdfIn PDF document text
    • https://tajuweselu.weebly.com/uploads/1/3/4/3/134362517/1792703.pdfIn PDF document text
    • http://creditscorehelp.info/dirt_farmer_all_quest_guideqpfcw.pdfIn PDF document text
    • http://onlineeshop24.xyz/star_wars_rogue_one_film_locationsi5tct.pdfIn PDF document text
    • http://varistop.site/96893804343eno7x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dudotofuzariw.rf.gd/acid_base_properties_worksheet.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_off0000ea12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA12 5036 bytes
SHA-256: 07298e7407cbc3b503ce4cedd3f167257b35738b14f177c2aea49a190fdbc947
font_01_sfnt_off0000fb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB24 10740 bytes
SHA-256: ff2125f782af515f6695a7a1743e6de2b81bd8416f6852b058f085d6997e4c17

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