Malicious PDF — malware analysis report

Static analysis result for SHA-256 03b54c6c834ca59b…

MALICIOUS

PDF

86.6 KB Created: 2021-03-15 20:00:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 81bcad49a89950138fef6b83ef9c879c SHA-1: 3d71c584194fcfa4a4363ca8671e790731ddef97 SHA-256: 03b54c6c834ca59b4d172c2aa5e1875b2fc7b6479295068aedc0d8fe35dcb0ec
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm with numerous external URLs, many hosted on disposable domains, suggesting an attempt to distribute phishing content or malware. The document body is heavily obfuscated and unreadable, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/aws?utm_term=survival+of+the+fittest+quote+origin PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421478/normal_5fd066b754835.pdfIn PDF document text
    • http://nomokosu.iblogger.org/93248915671.pdfIn PDF document text
    • https://cdn.sqhk.co/velabolo/ihWiajh/22876298127.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/ijge7dR/sceptre_tv_65_review.pdfIn PDF document text
    • https://cdn.sqhk.co/pifonode/ijhedL4/38055317555.pdfIn PDF document text
    • http://wugafis.66ghz.com/383891243.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505837/normal_602621f9823f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485807/normal_603a725fe9b72.pdfIn PDF document text
    • https://cdn.sqhk.co/zulatobi/iifjjgI/dream_in_past_tense_spanish.pdfIn PDF document text
    • http://ruwaxidalemib.iblogger.org/rofagovogiluwotugolarevi.pdfIn PDF document text
    • http://1xbets-reg.site/adobe_premiere_pro_2020_downloadhlwsg.pdfIn PDF document text
    • http://xamakag.iblogger.org/english_literature_novels_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sebuwemid/jJjjjcD/flourishing_empires_hack_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/dexizajifu/jbichan/beautiful_girl_hd_wallpaper_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/zixapegof/ihaF3hi/jenonewulagiseni.pdfIn PDF document text
    • http://bossyonlinex.com/union_pipefitter_wages_californiap60un.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/aAhfRLv/cycling_clothing_winter_guide.pdfIn PDF document text
    • http://garogegarar.22web.org/jimofilufok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tojozojorezew.epizy.com/crazy_train_chords.pdfIn PDF document text
    • http://nadurajamewe.epizy.com/sowafazonunozakibagi.pdfIn PDF document text
    • http://kobezitidub.rf.gd/98133255148.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_off000114c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C7 5316 bytes
SHA-256: d5ec541bc798be4f4267dbbb1ed67ad2a3118e82b86654cbc3a11afdc20c0836
font_01_sfnt_off000126dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DC 11504 bytes
SHA-256: 5d3f00615c9970dab2a065cdc65529a4d5297e6986d69c958e3771b12391630c

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