Malicious PDF — malware analysis report

Static analysis result for SHA-256 772f06d3f3889e29…

MALICIOUS

PDF

75.1 KB Created: 2021-03-23 21:35:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f25ba53b4f988a2950fd7609cb79e1eb SHA-1: d408bf963707caab935201b9141c9b141b280201 SHA-256: 772f06d3f3889e29d600f7a2fb0d74a27d7b1bdcf688a447cd24cf9e71ef584d
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 are obfuscated or lead to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic and ClamAV detection. The document body, though heavily corrupted, suggests a lure related to technical instructions, aligning with phishing or malware distribution tactics. The presence of embedded URLs and the ML classifier's high confidence score further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=how+to+replace+a+square+d+pressure+switch
    • https://cdn.sqhk.co/wifurovud/YqDFejf/58765661014.pdf
    • https://cdn.sqhk.co/nububufi/5sjbVjd/anth_movie_songs_free.pdf
    • http://tuxiwos.iblogger.org/napofogile.pdf
    • http://padazaj.iblogger.org/ffx_2_blitzball_training_guide.pdf
    • https://cdn.sqhk.co/kigimole/DChgKje/96144715520.pdf
    • https://cdn.sqhk.co/zozevuxe/QhiicT2/sst_answers_class_10_history.pdf
    • https://cdn.sqhk.co/pixukinoma/id8jfgi/airline_commander_mod_apk_hack.pdf
    • https://wekupadafar.weebly.com/uploads/1/3/5/3/135315244/giperosineluloba.pdf
    • https://cdn.sqhk.co/putomikoluku/jca6hFL/horse_running_gif_file.pdf
    • https://cdn.sqhk.co/kabutijefix/UnrR7ZJ/ghost_rider_fortnite_cup_time.pdf
    • https://fuxureriwixivo.weebly.com/uploads/1/3/0/7/130739224/denikuwizijuwawum.pdf
    • https://cdn.sqhk.co/bitijude/ZXfSieR/14285468791.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lalafen.epizy.com/fabesus.pdf
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_267793296e8642c8a6ee0bd2f45f1feb.pdf?index=true
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_d8fd6f0b4e4742a8b1de0ea161a6ce4d.pdf?index=true
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_27dc0fc9a3374b4b99127c6d086c5152.pdf?index=true
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_c3edb7a20fd74f5b8a23e0cd98ac23cb.pdf?index=true
    • https://64e1471b-64f8-4582-b127-b1692805dd1b.filesusr.com/ugd/507a3d_0388a7ac010f42b6bda76483b05acf43.pdf?index=true
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_dcafcc424d074c6b9a8dff0bb9ae6ef5.pdf?index=true
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_7d027991120c472eb36161efa2180102.pdf?index=true
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_d20bbdca6d27497a8a93f66e0b8ded25.pdf?index=true
    • http://mevonaku.rf.gd/hmis_label_template.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7a4.bin
a5a304b69da2f8c81539e13f0ed1596c83bde6015cb1769168f8668e8b5aff71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A4 5340 bytes
font_01_sfnt_off0000f9cc.bin
4b0acf61e983f43eed477c8961d085da8225b1f624f5a713e49c143d0fcb3ae9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CC 10808 bytes

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