Malicious PDF — malware analysis report

Static analysis result for SHA-256 012326e2c75f822f…

MALICIOUS

PDF

83.4 KB Created: 2021-01-21 15:48:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ad98336826f1af430b4540dd3f1675f0 SHA-1: d531809fb88235dc8360f9adb28bd9c6160f8172 SHA-256: 012326e2c75f822fb87cb73444cb6ebf3093340bad7dee9304a908caff4f4c56
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a link to known redirector infrastructure and a large link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest a phishing or spamming campaign, likely delivered as a spearphishing attachment. No scripts were extracted, but the PDF structure itself is used to host numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://gettraff.ru/123?utm_term=faceing+math+lesson+4+factoring+polynomials+answers In PDF document text
    • https://cdn.sqhk.co/sewadokoka/NEijlhg/metal_soldiers_2_apk_hile_android_oyun_club.pdfIn PDF document text
    • https://cdn.sqhk.co/baxemazisod/dmhggjD/tolawexideruwixunur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369930/normal_5f8ab4308a150.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450519/normal_5ff2b2ac92ef4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368979/normal_5fe5063c80717.pdfIn PDF document text
    • https://zamokofoviwikaz.weebly.com/uploads/1/3/0/8/130815095/talew-lijiw.pdfIn PDF document text
    • https://cdn.sqhk.co/fabadipub/jhFXhc9/posomiladudubit.pdfIn PDF document text
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/wukogizubejoxen-wuwol-fojid.pdfIn PDF document text
    • https://fejiwapofiji.weebly.com/uploads/1/3/4/6/134699364/32cd2ab41.pdfIn PDF document text
    • https://pikoxujedogusu.weebly.com/uploads/1/3/4/6/134665618/dbe5a9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374699/normal_5fe6c4bc29727.pdfIn PDF document text
    • https://xasamaxubema.weebly.com/uploads/1/3/5/3/135387487/6895467.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368468/normal_5fc18598a6991.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001052d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052D 5664 bytes
SHA-256: e50aff050c8a8c6541a68c6aaa115ae7434517f11c293e618970a9cace5f31e0
font_01_sfnt_off0001186f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186F 12056 bytes
SHA-256: 3c88b02c744636dd1e0ff25cc56dfdb51a4eb6d17c4d4d8b0f185635fe39bf91

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