Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a5bce20358de6a…

MALICIOUS

PDF

76.5 KB Created: 2020-11-19 22:33:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a17ab4105df23f789f3161ca93979c6d SHA-1: 78e832fec1ddffa5f303d78a9ded7da4e2fdaae4 SHA-256: b4a5bce20358de6a19c845ff8d2a581326e2faa9e5a6150ad24932b11ffd4695
214 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and ML classifiers. It contains a large number of embedded links, with at least two pointing to known malicious or redirector infrastructure. The document body is heavily obfuscated, but the presence of numerous external links suggests a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=alaska+channing+2+coal+stove+manual In PDF document text
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/5029ff21.pdfIn PDF document text
    • https://puxedeva.weebly.com/uploads/1/3/4/7/134730870/teraziwi.pdfIn PDF document text
    • https://todoxaladavefuk.weebly.com/uploads/1/3/4/5/134529573/4715583.pdfIn PDF document text
    • https://lexixebi.weebly.com/uploads/1/3/4/6/134670289/kerogiwupe.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/7845672.pdfIn PDF document text
    • https://kirenokasanav.weebly.com/uploads/1/3/4/4/134445236/ecdcdf55fb.pdfIn PDF document text
    • https://wetifojijebene.weebly.com/uploads/1/3/4/4/134474841/5382676.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/remeranexe/anemia_ferropriva_pediatria.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/xapotejubopoduwevuga.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/62801303859.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/zuletipudasafurufakuwivu.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/ruruxuxigotimisuf.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/vuvifibixivujenakowa.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/how_long_is_a_catholic_wedding.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/whole_wheat_fillo_dough_sheets.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE17 5364 bytes
SHA-256: eee9058997215c40455ff8a95c561b10817262a4b2b236f83121cb3f10b999c9
font_01_sfnt_off0001003c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003C 10772 bytes
SHA-256: ccb7fd4ab3952b93f5d80c8ec75fb692ca74e87074c3090234366be4f4d7ab1b

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