Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f5ad87a310dcff…

MALICIOUS

PDF

90.7 KB Created: 2021-03-24 19:02:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 1fd26fedd79c47376e6bb6d547097e36 SHA-1: 2fd2f127121967b66841b416462deb8f6719b7d2 SHA-256: a9f5ad87a310dcffc33d41ec850adaf9faf92f5527eb4ba7c9f33e76d4a32612
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, indicative of a link farm or phishing operation. ClamAV and ML heuristics confirm its malicious nature, classifying it as a phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://leonvi.ru/strik?utm_term=what+is+sql%252Aplus+command PDF link annotation
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/bilesujineveb-jizozugena-jodiwa-zotimumevida.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381752/normal_601b22cf1efe3.pdfIn PDF document text
    • https://bakijowo.weebly.com/uploads/1/3/4/7/134726649/xulonufula-marovibonopi-neneburifu-kewerefox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451545/normal_601445e48c409.pdfIn PDF document text
    • https://cdn.sqhk.co/janogoxuke/MHYjcii/gixafisiwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427514/normal_601c71572773d.pdfIn PDF document text
    • https://cdn.sqhk.co/mivijigonof/if1U4TI/ordnance_artillery_meaning_in_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/AghVfhg/jowawudi.pdfIn PDF document text
    • https://cdn.sqhk.co/fowipovoji/L8kQvhe/29004142001.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454546/normal_605b03ca512d3.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/fgcgdJq/ding_dong_ravers_wife_instagram.pdfIn PDF document text
    • https://sifajovu.weebly.com/uploads/1/3/4/8/134874608/bobifegipilupew.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/sasufufa/lepunasaxedumewotis.pdfIn PDF document text
    • https://0eaabcdb-938a-45a6-85a3-1a7d796bbcdd.filesusr.com/ugd/8d6d25_621bc190fd1f45ff94984358b75ed605.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gosete/10th_class_english_grammar_question_answers.pdfIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_79e43a28026c4beb87153e2c1713f8fd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/giburutasovit.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/samsung_ue32eh5000k_spec.pdfIn PDF document text
    • https://7e574f8b-ef34-4833-8dee-b18f3ac9fc91.filesusr.com/ugd/af8ffd_022806ff10804e8883b8684888869241.pdf?index=trueIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_3ae2c7e6ea78416f82f1d50cb15fba0d.pdf?index=trueIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_64e3fe649cde426e9349ef3c99c6bf47.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF680 5424 bytes
SHA-256: 2147915d8694af4f699f85f96832516c0d38cd40b494a4436adc199150767abc
font_01_sfnt_off000108db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DB 5964 bytes
SHA-256: 3bbc87fd1849bac94f919d4cf35f382cbaf323a8ce3f758f44e9dc746595425b
font_02_sfnt_off00011c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9E 11492 bytes
SHA-256: 66832e0de546dfe76cf4e5257484f4525b4f3778ff8382a37c14dc4641b64754
font_03_sfnt_off000143e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E9 17236 bytes
SHA-256: f90c2c7239315d2e0fc1e5ce97e677f51387f02be1a938e6f377e2733dd00a5f

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