Malicious PDF — malware analysis report

Static analysis result for SHA-256 991a99170506961e…

MALICIOUS

PDF

91.2 KB Created: 2020-11-11 19:09:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 381c46a14fc33726d891e42e0e30551c SHA-1: e3f24588127834d6df2db5bb2f3fea27ecf4f00c SHA-256: 991a99170506961ec54b4391b1f5bd079864ba10cea75f16bf0b3f3fb202a9cc
194 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDFs hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of a 'download' button lure further supports a malicious intent to redirect users. ClamAV detection and ML classification confirm the malicious nature, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/strik?utm_term=bank+po+book+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391000/normal_5f9742756bd07.pdfIn PDF document text
    • https://tijujuvuxerupuz.weebly.com/uploads/1/3/4/2/134236121/9550092.pdfIn PDF document text
    • https://fisizupesaxog.weebly.com/uploads/1/3/1/6/131636899/xigikuzijew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369768/normal_5f8a7adfd9228.pdfIn PDF document text
    • https://jifemeput.weebly.com/uploads/1/3/4/3/134398411/d7c0e79dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369318/normal_5f932e75219b1.pdfIn PDF document text
    • https://rogefiraf.weebly.com/uploads/1/3/4/5/134581109/polevobip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380219/normal_5fa1bc661da5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5f870158ef3ac.pdfIn PDF document text
    • https://tanutalavisa.weebly.com/uploads/1/3/4/0/134000413/a863e2.pdfIn PDF document text
    • https://majizozu.weebly.com/uploads/1/3/4/5/134598595/nubazujawipowam.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/rironila-burufawilifuzum-guvexeni-jiwubigirig.pdfIn PDF document text
    • https://sabijodamibig.weebly.com/uploads/1/3/0/7/130775907/2657289.pdfIn PDF document text
    • https://lotagixowila.weebly.com/uploads/1/3/1/1/131164100/9150059.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
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/gubakukesatiji.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/60429442958.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE267 4648 bytes
SHA-256: 59e549d4675080cf268a49aef3d5a8c3f8a28ccf8689959e8eb610f59cf88077
font_01_sfnt_off0000f23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23F 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off0000fd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9B 2092 bytes
SHA-256: 13678a14b930e6d42e11b2ac41b13981c2c7f5938cc30cfb194ad51886f1f1dd
font_03_sfnt_off00010740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10740 10564 bytes
SHA-256: 037ad32c4c7b09a1abfd28bbfab0a5b3e889fe11dbb4de4ad484b9a00b7c7fdf
font_04_sfnt_off00012b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B26 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
font_05_sfnt_off00013928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13928 11108 bytes
SHA-256: 7388bb0d341b4b539ed3c787c97212ea53335b46c6e1de9f2df59aab034713a9

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