Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef815ac412622134…

MALICIOUS

PDF

74.6 KB Created: 2021-02-25 14:33:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 08395b77dd80605bdcf2ddac1c323451 SHA-1: e7e1c5795532b2457f7939503988e2489ac46230 SHA-256: ef815ac412622134d4485522807ce8bc35df1efa7b60a0693c8634b0dafa7fb7
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. Heuristics indicate a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/award?keyword=best+gmat+prep+books+manhattan PDF link annotation
    • http://microbestdigitalmeter.xyz/lixulipafuwowaruj6x4w3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417805/normal_5ffcf33dbe279.pdfIn PDF document text
    • http://trendmobile.ru/venom_hd_wallpaper_for_mobile319a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368751/normal_602a745c715f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394073/normal_601b10492573e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422367/normal_6029c5ffbe100.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/6XAhfOs/2d_shooting_games_online_multiplayer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465257/normal_5fe7effd49e94.pdfIn PDF document text
    • http://ita-bio.fun/bojipitilapatuwvqetn.pdfIn PDF document text
    • https://cdn.sqhk.co/judawube/hgIgftO/13470372755.pdfIn PDF document text
    • https://cdn.sqhk.co/fopeziriga/ficScGT/96840611872.pdfIn PDF document text
    • https://cdn.sqhk.co/rubogomuweme/7idg2Ri/boxovomifinugasizabov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467561/normal_601f414b1c9a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422371/normal_601fec8ea5804.pdfIn PDF document text
    • https://cdn.sqhk.co/lexikegije/gggDibi/dead_zed_3_hacked_unblocked_weebly.pdfIn PDF document text
    • https://xubusiruk.weebly.com/uploads/1/3/4/4/134481781/845c1b188.pdfIn PDF document text
    • https://julasunanuk.weebly.com/uploads/1/3/4/3/134308365/pajab-xamubasefi-xunedutopimuvo-fevobimupima.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382187/normal_6023af6b72942.pdfIn PDF document text
    • https://cdn.sqhk.co/wejuladuke/iUgjxRg/gapobupaleduleruje.pdfIn PDF document text
    • https://dutilugamon.weebly.com/uploads/1/3/5/3/135301630/5144569f2ed48b7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ea1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1B 5452 bytes
SHA-256: 21ad2f15ae34a7df29a801236ff5252dffec52b25afecdf560b715d4836704ad
font_01_sfnt_off0000fc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7B 9556 bytes
SHA-256: 29afe1400fe523cc73696756319a327a27e8802a8ca0cd73c4850c2ca28bec02

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