Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc8dd1e8ebe22e2…

MALICIOUS

PDF

79.2 KB Created: 2021-03-04 09:44:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c5932c332840cae4ac3bc867bc93c5ed SHA-1: 0a9d01672ab1e429ffd75e99707dbe28278b0637 SHA-256: 8dc8dd1e8ebe22e296b2435f3c2ce05a24667ee93f0fe820f9f0b05d1a865bed
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a phishing or malware distribution scheme, likely involving a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://botokaw.ru/aws?utm_term=what+is+the+purpose+of+shop+drawings PDF link annotation
    • https://zetidikusas.weebly.com/uploads/1/3/4/7/134740093/xekomimamafu.pdfIn PDF document text
    • http://puruzil.iblogger.org/59254370801.pdfIn PDF document text
    • https://lurusinobafor.weebly.com/uploads/1/3/2/7/132710654/7524615.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460466/normal_5ff415b291104.pdfIn PDF document text
    • http://getegenufiduso.66ghz.com/christie_projector_lwu505_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruzoguniwu.epizy.com/fojagoxolulom.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/wutale.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/3022524081.pdfIn PDF document text
    • http://rogofideb.onlinewebshop.net/octavia_e_butler_dawn_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/criminal_songs_free_doregama.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/can_a_chevy_traverse_tow_a_boat.pdfIn PDF document text
    • http://gubodasitonobu.epizy.com/xapemizulabigujirakevivi.pdfIn PDF document text
    • http://sakamajuxuga.epizy.com/folagarijaxusaze.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB62 5376 bytes
SHA-256: 7335d809924d303c6bf08b902b7a84d8d9aa8c06af129517d719e47cbc069355
font_01_sfnt_off0000edc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC1 10528 bytes
SHA-256: 881448f750e3a1761109b0d03e7dd00e2f9710ddf829d6d1efd45d995dbf2724
font_02_sfnt_off00011228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11228 18620 bytes
SHA-256: d78b4be940b8790aec4238d15ad75d28c8b4e0eb884e8f789b123b63d8f6e1b7

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