Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e3f58e9f46a38f…

MALICIOUS

PDF

77.6 KB Created: 2021-03-28 05:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 889530a2850ab85dbcec6a2b4f95f119 SHA-1: e185bc913bc359f0259e91ea502da0fe91cd0322 SHA-256: a1e3f58e9f46a38f9a3cbfdadeee8c7951c2b64a8eeaece01ba001045d887a25
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF link farm, suggesting a malicious intent to redirect users to potentially harmful content. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate a phishing or content-distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/award?keyword=abecedario+en+ingles+con+pronunciacion+pdf
    • http://bugilinupapud.mygamesonline.org/jematelizixawujosiborew.pdf
    • https://voxudipuxun.weebly.com/uploads/1/3/5/3/135319737/64335adc9a97.pdf
    • https://pejivepomut.weebly.com/uploads/1/3/5/3/135339444/gebun.pdf
    • http://rawokixe.22web.org/el_atrahasis.pdf
    • https://tudogevu.weebly.com/uploads/1/3/2/7/132741144/vumavediz.pdf
    • http://nefuzixitelu.iblogger.org/31743226573.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zupenafud/grade_3_math_textbook_download.pdf
    • http://tawosowi.epizy.com/90194236690.pdf
    • https://s3.amazonaws.com/gapivegek/song_of_solomon_sparknotes_chapter_4.pdf
    • https://s3.amazonaws.com/tometubufimopim/egzamin_gimnazjalny_angielski_gramatyka_wiczenia.pdf
    • https://s3.amazonaws.com/zozuxukoxo/62843692032.pdf
    • https://uploads.strikinglycdn.com/files/bdd752b4-5d02-414b-88f7-b7a9463531b8/im_losing_it_meaning_funny.pdf
    • http://tasijojaludet.rf.gd/blurryface_live_dropbox.pdf
    • http://livirava.atwebpages.com/bemubinizipurebo.pdf
    • https://s3.amazonaws.com/kelageketisefuv/interview_invite_email_templates.pdf
    • https://uploads.strikinglycdn.com/files/cdb383eb-6949-43ca-85c6-10b5c5b2ed07/thermal_power_plant_startup_procedure.pdf
    • http://jexalajepufuxin.rf.gd/xaleroxilobuxelafowipu.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_off0000ea1d.bin
be7fe1ec56df3980218038d0d98e0c063b1c303b6cb26847b4b269d74f341f5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1D 5452 bytes
font_01_sfnt_off0000fcb3.bin
27e782eff3a081c52313f357e5b964e52167d58f5a4d1d0454a90357a441c016
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB3 13172 bytes