Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b8c723a053bb5b…

MALICIOUS

PDF

75.3 KB Created: 2021-04-07 00:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 474fe0640f62ee47c9438a05c8cb8d1f SHA-1: 8a3008432a715dba0a5059f1a32f91fde3a68e32 SHA-256: d1b8c723a053bb5be68352bfab90ebfffba9d5e8f448dc1857a3c2a87351716b
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 numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. The document body, though heavily obfuscated, suggests a lure related to 'cell cycle worksheet answers', aiming to trick users into visiting the linked malicious domains. The presence of multiple disposable hosting domains and link farms indicates a phishing or malware distribution campaign.

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://botokaw.ru/wix?keyword=cellsalive.com+cell+cycle+worksheet+answers PDF link annotation
    • https://pokakananame.weebly.com/uploads/1/3/4/4/134457622/2fba777d4.pdfIn PDF document text
    • http://wiwovurezibaso.getenjoyment.net/medullary_thyroid_carcinoma_guidelines.pdfIn PDF document text
    • http://tapasin.sportsontheweb.net/mezinipovizuxavisorinokov.pdfIn PDF document text
    • https://cdn.sqhk.co/zidenesek/PgU0ggd/english_songs_list_2020.pdfIn PDF document text
    • http://firstreadersclub.com/jonozabidekqd1jd.pdfIn PDF document text
    • https://cdn.sqhk.co/vegedusovo/iaBfhfb/wivivarozoruvalugejoxoki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459060/normal_600fe655b0cf6.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/vodiwuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389830/normal_6025eb4979adf.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/zebodetefufokubejerofeg3zac1.pdfIn PDF document text
    • https://basedupapopulow.weebly.com/uploads/1/3/4/3/134344364/0dfca1dfce9.pdfIn PDF document text
    • https://fanamiwa.weebly.com/uploads/1/3/4/0/134013174/sobonexog.pdfIn PDF document text
    • http://jopagozopive.medianewsonline.com/42086280847.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370089/normal_5ffd4cac02630.pdfIn PDF document text
    • http://goodik.fun/djembe_drum_rhythmsyovvp.pdfIn PDF document text
    • https://vedefagam.weebly.com/uploads/1/3/0/8/130814874/javozowu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446930/normal_5fe18232274fd.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://b09d99c6-da67-4e55-b5b3-baceba093817.filesusr.com/ugd/a69c6c_1b510ac214c64218a4ca63f3c02787fa.pdf?index=trueIn PDF document text
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_c27df25c51d747219bc3e5e4e2b91394.pdf?index=trueIn PDF document text
    • http://nejarisiwudu.atwebpages.com/how_to_look_up_mailing_addresses.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_off0000db4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4D 5200 bytes
SHA-256: 4977cae66be50b7eaa0f81d7acfc137663034c8b738a044b16f865567a507203
font_01_sfnt_off0000ecea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEA 10816 bytes
SHA-256: dfa6566c80a8c881e0153d86d77bfa76a4a10d6d34e3197d3d627086b63f7e55
font_02_sfnt_off000111ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AC 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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