Malicious PDF — malware analysis report

Static analysis result for SHA-256 852a7945cccb7873…

MALICIOUS

PDF

101.4 KB Created: 2021-03-25 18:17:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 650f7dfdc33a3a7ea7af0c68820aefd4 SHA-1: 9565f8ceae8e7db2191b633a65905880d3f73008 SHA-256: 852a7945cccb78731236a3ad4a7b97f0d08021f6e2a160ee98368445d60256e8
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to obscure the final malicious destination. The document body, though heavily obfuscated, appears to be a lure related to an ebook, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://maypoin.ru/strik?utm_term=photography+changes+everything+marvin+heiferman+ebook PDF link annotation
    • http://soxutabuxupene.22web.org/genetica_na_agropecuaria_livro.pdfIn PDF document text
    • http://psylath.com/nutukarjzrhr.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/4fhij0S/jolufije.pdfIn PDF document text
    • http://shop-you.xyz/aftershokz_trekz_titanium_vs_airnp5a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478402/normal_6008ddad0a088.pdfIn PDF document text
    • https://cdn.sqhk.co/tedogegez/cgdxjfu/police_audio_song_download.pdfIn PDF document text
    • http://ritual-venki.online/variance_standard_deviation_pptj9v9h.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/C7hgZH8/coupons_for_walmart_grocery_pickup.pdfIn PDF document text
    • http://thedouche.xyz/inference_worksheets_with_answers4ikb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419413/normal_600c703be9f03.pdfIn PDF document text
    • http://urolog.xyz/59350525901nrt8z.pdfIn PDF document text
    • http://lavkavkusa.store/speak_study_guide_answer_key0ihhm.pdfIn PDF document text
    • http://gaxotewaboka.iblogger.org/ang_pipit_minus_one_song.pdfIn PDF document text
    • http://creditpm.com/26222808750v95qo.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://lagadasisipas.rf.gd/beautiful_disaster_travis_maddox_quotes.pdfIn PDF document text
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_aead8226685346888fb96c6dba89c1ec.pdf?index=trueIn PDF document text
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_920eb7ba272b4c39a36506d1eca027a6.pdf?index=trueIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_9af9940a3cc14fe287b1bc383c34d9ef.pdf?index=trueIn PDF document text
    • https://a96bb073-a604-4091-b2b3-8ecc1f64d3e7.filesusr.com/ugd/e3c460_c59324a004ac4cccbe01e4af4dfcd342.pdf?index=trueIn 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_off0001368a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368A 5552 bytes
SHA-256: f0c3576be210d2e6004ccdd26d76df9e59b17aaa95bfaa5e46234d7236087e1a
font_01_sfnt_off0001494c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1494C 15012 bytes
SHA-256: 4a2eaba907a26aabfc9ce56d82bac79c8a816f10934cfa9ccf4b069fe218a794
font_02_sfnt_off00017801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17801 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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