Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e6878932c85961f…

MALICIOUS

PDF

71.7 KB Created: 2021-02-15 11:28:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 062c7a6721ab45156a474e40a1e356eb SHA-1: 272cdadfd55064f12a793b4345e5db271c6bf708 SHA-256: 8e6878932c85961fdaec09d7affe622bdbd56dfa73ea0648fd2621d54502e024
184 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised with a seemingly innocuous topic about dieting. This heuristic, combined with the ML classifier's high confidence and ClamAV detection, strongly indicates a phishing attempt. The embedded link directs users to `https://yafferge.ru/123?utm_term=how+does+yo+yo+dieting+affect+metabolism`, which is a primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=how+does+yo+yo+dieting+affect+metabolism In PDF document text
    • https://cdn-cms.f-static.net/uploads/4443576/normal_602798acc7bb7.pdfIn PDF document text
    • http://polnews.xyz/wazipukoferewabudafotitit2dfcd.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/ghXGbjc/lynx_vs_bobcat_tracks.pdfIn PDF document text
    • http://micrometer25bill.site/7202654635000kbz.pdfIn PDF document text
    • http://farvestnn.ru/57242946273xor07.pdfIn PDF document text
    • https://cdn.sqhk.co/pawijilabu/ii2jd80/24_hour_food_near_me_delivery.pdfIn PDF document text
    • https://cdn.sqhk.co/farosexuto/5IpBD1F/newupivat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412161/normal_602a17f72140e.pdfIn PDF document text
    • https://cdn.sqhk.co/kosojilufut/h3wjiib/zombie_derby_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403534/normal_5ffd1b5bf0261.pdfIn PDF document text
    • https://cdn.sqhk.co/retirijozi/ggMWcFI/thrifty_car_sales_mountain_home.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xatonidimo.rf.gd/2308719464.pdfIn PDF document text
    • http://fakuzilezozo.epizy.com/cyrano_de_bergerac_catal.pdfIn PDF document text
    • http://rivowotow.epizy.com/37920084800.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_off0000da9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9D 5540 bytes
SHA-256: 726ff88834fd095a05a4c94bb2eca7deb511e8c8b35725f26937bbbb2abda072
font_01_sfnt_off0000ed81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED81 10800 bytes
SHA-256: 25e5b802dfa862a5a04028c256309014519630862a7bee57146b52b8f0147967

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