Malicious PDF — malware analysis report

Static analysis result for SHA-256 624c9cc0c68ae268…

MALICIOUS

PDF

76.1 KB Created: 2021-03-19 16:46:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 297c3ee432b34838bad9ebac2fe6d8f8 SHA-1: a4ccf518c5ba2f64bc70a64ccd02a88d7a9693b5 SHA-256: 624c9cc0c68ae268cd5738f61238c2de0f1333d46a7c6d1dc6cab86e95da4f85
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one hosted on disposable infrastructure, suggests a link farm or phishing lure. The document body, though heavily obfuscated, contains references to educational materials, which is a common pretext for phishing or malware delivery.

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://lozipotod.ru/wix?keyword=pearson+algebra+2+student+companion+answers PDF link annotation
    • https://tefegori.weebly.com/uploads/1/3/1/6/131637168/7419439.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/VFiiife/xofilexiga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501383/normal_602f090b2a703.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/jbhjc1f/kiko_milano_lip_gloss.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486200/normal_5ff472053a4ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481157/normal_5fe1fb0b4dc67.pdfIn PDF document text
    • https://regifevadep.weebly.com/uploads/1/3/4/4/134476302/nefapuvubixakamutip.pdfIn PDF document text
    • https://suzagosezamonu.weebly.com/uploads/1/3/4/4/134446802/381be0.pdfIn PDF document text
    • https://cdn.sqhk.co/moserusoba/gfhfDcj/51448722371.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381748/normal_60435b3190f82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482402/normal_60228336c538b.pdfIn PDF document text
    • https://putukaxuke.weebly.com/uploads/1/3/1/4/131437363/zosexovijusobive.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/agust_d_suga.pdfIn PDF document text
    • https://67bb8873-ca08-4da4-87c0-60a8072ebff6.filesusr.com/ugd/a838c0_e8ccd591b48b4d278db0b37cb6e89c6a.pdf?index=trueIn PDF document text
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_2d84d45f723d49ca931ca078ade3b476.pdf?index=trueIn PDF document text
    • http://vosimamasi.epizy.com/azar_gems_hack_android.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/xadomewamix.pdfIn PDF document text
    • http://lexireto.epizy.com/font_asset_not_found_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/udemy_course_video_er.pdfIn PDF document text
    • http://lopovimefadepom.epizy.com/koronawilo.pdfIn PDF document text
    • http://kevatudoritek.rf.gd/michelin_guide_france_2019_english_edition.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_off0000e806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE806 5760 bytes
SHA-256: 39b8516ad6475e5ffe69345e044266338547d10aa00ec3f2275b00edf8d2d853
font_01_sfnt_off0000fb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB98 11040 bytes
SHA-256: 6feb191563f1e31e41456b97d9084c155ff9e0b1a1cc50ccc4206548d3b745d7

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