Malicious PDF — malware analysis report

Static analysis result for SHA-256 30af21fe76817ac5…

MALICIOUS

PDF

72.8 KB Created: 2021-03-01 03:41:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74f3153cc7b7cd8e75d9559e1ecd23db SHA-1: 1985c4311c2942efa24e02314c17f92ccce0b3ad SHA-256: 30af21fe76817ac5c64e465057278d19f7320ed2884436133556667ed0193b37
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 link farm, with the primary URL being `https://druttle.ru/wix?keyword=cordierite+thin+section`. This behavior, combined with the ClamAV detection and ML classifier flagging, strongly suggests a malicious intent, likely for phishing or distributing further malicious content. No scripts were extracted, but the structure indicates a malicious PDF.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/wix?keyword=cordierite+thin+section
    • http://pugisapi.mypressonline.com/napuno.pdf
    • http://wamuvosuvebupa.iblogger.org/define_phantom_menace.pdf
    • http://xilexevu.scienceontheweb.net/27951368918.pdf
    • https://weraxugunelega.weebly.com/uploads/1/3/4/7/134719696/saruri.pdf
    • https://nazalufu.weebly.com/uploads/1/3/1/4/131409274/zopixinopi.pdf
    • https://nosuzodudoj.weebly.com/uploads/1/3/4/5/134588086/6517072.pdf
    • https://cdn.sqhk.co/jaxubefe/idjeAhg/allegiant_stadium_torch.pdf
    • http://ropewelopison.iblogger.org/civil_non-_domestic_case_information_report_maryland.pdf
    • https://fofonamid.weebly.com/uploads/1/3/4/8/134869219/3734793.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nuxulikiwab/how_to_find_a_hobby_as_a_kid.pdf
    • https://s3.amazonaws.com/teximikamukubo/candlelight_punjabi_song_ringtone.pdf
    • http://kusogit.rf.gd/anandamela_2017.pdf
    • http://porumujowupof.epizy.com/mathematics_10.pdf
    • https://s3.amazonaws.com/sezebepit/fogosuzuzulagigi.pdf
    • https://s3.amazonaws.com/xeponodij/78929676918.pdf
    • http://bejiteviv.epizy.com/bufas.pdf
    • http://mewaparegun.rf.gd/is_algebra_2_hard.pdf
    • http://tuganireriwem.rf.gd/acr_gout_guideline_2017.pdf
    • http://ralirajuz.atwebpages.com/medium_difficulty_word_search_puzzles_printable.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_off0000e31d.bin
ae6c660e907bd659b6eb69452535989e153d37974fcb117a35f062d243530b7f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE31D 4692 bytes
font_01_sfnt_off0000f306.bin
6180eeb5934e4d17d9bb0fd2f1256fc03b3282dbb6df1e77376c0b35722e9281
pdf-font-stream PDF embedded font (sfnt) at offset 0xF306 10244 bytes