Malicious PDF — malware analysis report

Static analysis result for SHA-256 945ab8b98d6bddeb…

MALICIOUS

PDF

81.4 KB Created: 2021-02-22 00:03:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7300858be67e69454af74e21da988bce SHA-1: 14397d55f8feab545d52f3ea21846722c1587816 SHA-256: 945ab8b98d6bddeb59c6d6ab973d19a90401975dd3b26af01569ebf0d5d709e9
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://baarspo.ru/123?utm_term=maytag+top+load+washer+lid+locked PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462374/normal_5fd80eb57cb1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419628/normal_6001dfb7efd8f.pdfIn PDF document text
    • http://pro-komp-master.website/what_is_meant_literature_review_in_scientific_researchjbqp2.pdfIn PDF document text
    • https://zezowamizafomex.weebly.com/uploads/1/3/1/3/131381240/8568850.pdfIn PDF document text
    • http://megahit.space/54848388905yppor.pdfIn PDF document text
    • https://velumosatowe.weebly.com/uploads/1/3/4/8/134883763/dokifalaginat.pdfIn PDF document text
    • http://otomail.business/9957607886499icw.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/0d96feb8fa8c3da.pdfIn PDF document text
    • http://managerprogram.live/mp3gain_pro_2019_keyxtsnn.pdfIn PDF document text
    • http://dontbeshy.xyz/you_are_holy_oh_so_holy_chordst9eip.pdfIn PDF document text
    • http://gijixig.22web.org/fivovikulofok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422373/normal_5fce82c797b39.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
    • https://s3.amazonaws.com/fivebo/78372529382.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/cerebral_palsy_athetoid.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/samajurelakogivumalelu.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/40885815320.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/fractured_but_whole_character_sheet_titles.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_off0000f460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF460 5280 bytes
SHA-256: 2aa23148ffd358f05402d562d1dd53820167f53adf49a2dd74bd11c67a42e088
font_01_sfnt_off00010681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10681 10496 bytes
SHA-256: 3697d04a0212cc9b23f0a919b7338bb6f3eb7d1a541f5897e42a391010a075d5
font_02_sfnt_off00012a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A76 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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