Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba2a992f4db08202…

MALICIOUS

PDF

97.5 KB Created: 2021-03-26 17:37:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c587bd2072378148705b7ca333659bb2 SHA-1: 1ebd254035f54925125cec7d28960ddb8dc22eca SHA-256: ba2a992f4db0820289fa4d048dd401eae4b746dc97d6b524ad5ccbfd8e1ab927
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URIs, with one specifically pointing to a suspicious domain ('midufefew.ru') that is flagged as external. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of multiple links on disposable hosting further supports a link farm or phishing lure strategy.

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://midufefew.ru/wix?keyword=spyro+eternal+night+wii PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427506/normal_6035d252c577f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461485/normal_5fca7fc2d8097.pdfIn PDF document text
    • https://memugili.weebly.com/uploads/1/3/4/5/134526503/4283611.pdfIn PDF document text
    • https://xuzufudoroxibu.weebly.com/uploads/1/3/4/7/134755415/6585533.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501791/normal_5ff16a26c1e57.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/hp_laserjet_pro_100_color_mfp_m175nw_wireless_setup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481513/normal_6058da2277afa.pdfIn PDF document text
    • http://tiwegopoguxuzu.mypressonline.com/savonowisiligifu.pdfIn PDF document text
    • http://wukuname.mypressonline.com/nutritional_deficiency_anemia.pdfIn PDF document text
    • https://titugujogimob.weebly.com/uploads/1/3/4/0/134017720/dobetiwenav-febijinajo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474169/normal_6031d2c445efb.pdfIn PDF document text
    • https://nimivisedasefu.weebly.com/uploads/1/3/1/0/131070972/4031842.pdfIn PDF document text
    • https://xuberirerumona.weebly.com/uploads/1/3/4/5/134586272/dosupono.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jupegojut.atwebpages.com/dd_5e_werewolf_prestige_class.pdfIn PDF document text
    • http://xasejumav.onlinewebshop.net/osaka_airport_map.pdfIn PDF document text
    • http://teluroluxeterez.myartsonline.com/suxudogezijuvamokefebem.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/8124806512.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/my_pool_heater_wont_turn_on.pdfIn PDF document text
    • http://ziwivazud.onlinewebshop.net/18944924309.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_off0000e759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE759 28080 bytes
SHA-256: 03abb989cb7ed32ea34cb286ce4050cdf819d5e359bfd3136e7b5c0979f8c9ef
font_01_sfnt_off00013e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E69 5200 bytes
SHA-256: eeb6115a459a025cd0f4286386ccad1d49692bfa0eb5118e244719e6cd724613
font_02_sfnt_off0001502b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1502B 12252 bytes
SHA-256: 0a313e820052ae9a62a991d86cdf9247cc9df5c19c5abee8e19dcbe2468fa6cb

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