Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a008e81dc9e041…

MALICIOUS

PDF

85.5 KB Created: 2021-01-03 23:05:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7893c75ad8aa853d71461460a1ae8547 SHA-1: eb98540a63b8484527693a5362bf79957095e6d2 SHA-256: 63a008e81dc9e041805826a94a108599299f50a9fc78990819041268c3ec581b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple embedded URLs, with a primary focus on directing users to 'trafffe.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score point towards malicious intent, likely to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://trafffe.ru/123?utm_term=li%25C3%25AAn+qu%25C3%25A2n+mobile+apk+1.32.1.4 PDF link annotation
    • https://loputoporebile.weebly.com/uploads/1/3/4/8/134847610/243f9ec01687df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412408/normal_5f9da8bd44aac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427097/normal_5f9990f784046.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418370/normal_5fe41568ee0b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411921/normal_5fe8f926e62e8.pdfIn PDF document text
    • https://fofaxofik.weebly.com/uploads/1/3/4/5/134521529/1320457.pdfIn PDF document text
    • https://cdn.sqhk.co/gupetipek/icDwOje/suzujozujevuwubi.pdfIn PDF document text
    • https://sefuzogesosemo.weebly.com/uploads/1/3/4/5/134579576/c94dc9df7d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/luropiw/8638779675.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/vuronituwoxabu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c229e50-1d29-4d28-9c0f-7e67b5fdd802/start_em_sit_em_si.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4475655b-f8f2-4ba4-80b0-08c97169250c/zufifowevovuf.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB94 5624 bytes
SHA-256: 13ebebb70c5613c201b4b3aa9da620cf12cba3f256ae52731a100e99f99c8c95
font_01_sfnt_off0000edca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCA 24540 bytes
SHA-256: 52a685ac3f175cf434e8fb2531be83c72aed7c9e09099cbd78c15ac1714c6a6a
font_02_sfnt_off00012305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12305 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501
font_03_sfnt_off00013833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13833 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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