Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f01c3e4710b9e2…

MALICIOUS

PDF

96.6 KB Created: 2021-02-14 16:24:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 5d6e01ffb9e09aa5262fb4f85f3b4548 SHA-1: d0f5948119e25c9296888c1c68abc9cf5083289c SHA-256: 81f01c3e4710b9e204bc01f0d067ca80ac5ee7c78333fe5bea5a50d01b5e3938
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, and one specifically redirects to a URL containing 'minecraft combat handbook'. This indicates a link farm designed to drive traffic to potentially malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

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://yafferge.ru/wix?keyword=minecraft+combat+handbook+read+online+free In PDF document text
    • https://demaxezobenila.weebly.com/uploads/1/3/1/8/131856353/6126583.pdfIn PDF document text
    • http://nosinoski.shop/kaanchi_the_unbreakable_full_movie_480p9lxai.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409244/normal_5fd60df3cdbf2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376858/normal_5ff7601dd2b0a.pdfIn PDF document text
    • http://purpless.vip/zosasetprhx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428052/normal_5fda5b09a3d90.pdfIn PDF document text
    • https://pubasozivo.weebly.com/uploads/1/3/0/8/130813448/govaropoxigu-sibifuron-lorutu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406466/normal_5ff7c91798fa5.pdfIn PDF document text
    • https://xivunububan.weebly.com/uploads/1/3/0/9/130969166/gorusavolidodizut.pdfIn PDF document text
    • https://bowasizavaxilek.weebly.com/uploads/1/3/4/0/134042597/7b147e203200a5f.pdfIn PDF document text
    • http://sfhgfje5df.xyz/nedagipuforagumupuwivol4dxw.pdfIn PDF document text
    • https://dupagerenukuxat.weebly.com/uploads/1/3/4/7/134751723/4d971e66a8768.pdfIn PDF document text
    • http://hookup153.site/ideal_team_player_summaryllduq.pdfIn PDF document text
    • https://ligibokone.weebly.com/uploads/1/3/1/8/131858045/47eea3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446491/normal_5ff150e37991a.pdfIn PDF document text
    • https://fejisamuzek.weebly.com/uploads/1/3/4/6/134636520/nezilibikixi.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
    • http://banitazivi.epizy.com/83261974968.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001317a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317A 5080 bytes
SHA-256: fa338d177dd3eb3396827a991661f2b2db4d3b93768d49dcdc9317e531e966c6
font_01_sfnt_off00014287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14287 10716 bytes
SHA-256: 499c8bff1c22138b2bf5d17e45591b30a69c6e31a852ba2ee1898ecb2e53aa8f
font_02_sfnt_off0001672e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1672E 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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