Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44acd2e6c94f8ae…

MALICIOUS

PDF

77.6 KB Created: 2021-03-07 22:29:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e493ca9b3e764c0a7894b3ba6fa67261 SHA-1: 79e860762e6740ead643da1740c69e7f7d7a9ada SHA-256: a44acd2e6c94f8ae21d2570d28f0d4c03e521ea5de78e10e31d70baa8c2243b7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains metadata related to its creation, but the primary malicious activity is driven by the external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xezojetit.ru/aws?utm_term=como+elaborar+una+linea+de+tiempo+para+ni%25C3%25B1os
    • http://xuxetosufuzo.getenjoyment.net/7318891843.pdf
    • http://kenugizi.getenjoyment.net/xuwisezotebifufatopo.pdf
    • https://cdn.sqhk.co/vopufepivipe/Silajjg/football_tycoon_java_game_download.pdf
    • https://nitiruminaxodax.weebly.com/uploads/1/3/0/7/130738633/5378136.pdf
    • https://cdn-cms.f-static.net/uploads/4473637/normal_6043278ea3f9d.pdf
    • http://zokidinodajives.getenjoyment.net/canon_mg3520_user_manual.pdf
    • http://zijafanovidiz.sportsontheweb.net/24398904952.pdf
    • https://cdn-cms.f-static.net/uploads/4375073/normal_600d2f8d1e9b3.pdf
    • https://mutolumikiwow.weebly.com/uploads/1/3/1/8/131872082/727a352c.pdf
    • http://zujadise.scienceontheweb.net/75938526174.pdf
    • https://nezejigon.weebly.com/uploads/1/3/4/6/134611081/f6b431d4f9083f.pdf
    • https://cdn.sqhk.co/rapowipijes/7VTKC5X/dwts_recap_episode_2.pdf
    • http://keniworu.mywebcommunity.org/jekelopipujutule.pdf
    • http://suzofovolavuk.scienceontheweb.net/dakajuvideledela.pdf
    • https://cdn.sqhk.co/wovupeni/cQeijnQ/tirobiwijejepagoz.pdf
    • http://fakixigulidol.mywebcommunity.org/development_of_atomic_theory_worksheet_answer_key.pdf
    • http://dodajavux.scienceontheweb.net/jvc_kd-r960bts_pairing_full.pdf
    • http://wegaturagifo.getenjoyment.net/update_club_card_safeway.pdf
    • http://wugupomovupa.sportsontheweb.net/22647997209.pdf
    • http://nekuwagibajese.getenjoyment.net/geramopafibozatonivevifef.pdf
    • https://zojegidaluvimov.weebly.com/uploads/1/3/4/1/134109086/5893325.pdf
    • http://fazejajogavu.medianewsonline.com/braun_series_7_790cc_best_buy.pdf
    • http://siwosupegejolop.medianewsonline.com/30295395260.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kebenubes.onlinewebshop.net/how_to_lose_weight_fast_challenge.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eece.bin
c45c59f2fd301c92740ab47ff63357a849c9b5a41dbabefbf29d093bb68ac953		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEECE 5364 bytes
font_01_sfnt_off0001009d.bin
adfab16f2a2e715052544818e6dab4176b87f46c63e16c1e09c9384581e9e20b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1009D 11444 bytes

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