Malicious PDF — malware analysis report

Static analysis result for SHA-256 864341e60a2b0132…

MALICIOUS

PDF

75.6 KB Created: 2021-03-15 21:09:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69a42d76e697c7a6c311dfcfa8506875 SHA-1: bbd8989a37e5c889dac843746cb9d50c2f63baae SHA-256: 864341e60a2b01327b06fb760df23453bdd81cb09ba9048da6aed839da591c3d
164 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which point to PDF files with numeric slugs, suggesting a link farm or SEO manipulation tactic. The presence of a 'download button' heuristic further supports a lure-based attack. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/award?keyword=past+simple+exercises+pdf+pre+intermediate
    • https://beperupofifu.weebly.com/uploads/1/3/1/6/131636755/b92304fc43e75f2.pdf
    • https://cdn.sqhk.co/jezumasulej/jdgfshf/push_maze_puzzle_level_359.pdf
    • https://biwemazisemu.weebly.com/uploads/1/3/0/9/130969041/22ad1870aaba0.pdf
    • https://cdn.sqhk.co/bitowiso/idj2uhj/65891599079.pdf
    • http://tonorubur.22web.org/65559722643.pdf
    • https://nuxowodevuj.weebly.com/uploads/1/3/4/6/134609076/3b385.pdf
    • https://tunutepefa.weebly.com/uploads/1/3/1/4/131453603/8b1ec0.pdf
    • https://netopanuneju.weebly.com/uploads/1/3/4/4/134493403/2700603a76a.pdf
    • https://dobojadu.weebly.com/uploads/1/3/2/7/132711966/faec0.pdf
    • https://cdn.sqhk.co/dabozijide/bjcEG0g/muzetopemarew.pdf
    • https://cdn.sqhk.co/xalibolopov/czlC164/53800405939.pdf
    • https://cdn.sqhk.co/nukusigemug/iSgdhf2/81495796196.pdf
    • https://xoselupovogim.weebly.com/uploads/1/3/4/6/134610719/5136388.pdf
    • http://bitejodimoni.iblogger.org/rimegezexixolobataxaduxi.pdf
    • https://wesiravanenuje.weebly.com/uploads/1/3/4/3/134385991/walavutoxe.pdf
    • https://wipemaxo.weebly.com/uploads/1/3/5/3/135345075/3700370.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://razogop.epizy.com/92437253012.pdf
    • https://s3.amazonaws.com/zalomi/gevezejojakufebin.pdf
    • https://s3.amazonaws.com/naxozelozude/58369779242.pdf
    • http://namajoveteri.epizy.com/how_to_push_a_piston_with_a_piston.pdf
    • http://zulesubepire.rf.gd/23561153500.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd20.bin
9560acaeeb1d36d25e6bc7f7596f4ac85bf5e48d5718c913659f721dcfad7188		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD20 5048 bytes
font_01_sfnt_off0000ee2a.bin
a943caf7e21c78822f4cc57b734f404e8c5347384cd58fdc9e091348fb52214d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2A 10552 bytes
font_02_sfnt_off0001121c.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1121C 4324 bytes

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