Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa58d812d9fb4cb…

MALICIOUS

PDF

80.3 KB Created: 2021-03-01 06:41:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c52807583b0d760b76c45b4ff456e0fc SHA-1: d1efae1dcf7956ad7c7b8893b4c3b44ceaf8032a SHA-256: baa58d812d9fb4cbd164236af7bcf8168277513d5348ce8a32291a1fc8e1fbdd
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or SEO spam. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains keywords suggesting a lure for a specific search query, which is then used to present a large number of external links.

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://nipisod.ru/123?utm_term=xbox+360+controller+pc+adapter+driver
    • http://accface.in/mcdonald_s_breakfast_times_covidy1vqm.pdf
    • http://mon-fortuneo.best/geekbench_4_ios1gan6.pdf
    • http://esportzmlevent.com/greek_gods_yogurt_probioticswuncc.pdf
    • http://varietystore.website/lawejetetevesaxatamavez7dox.pdf
    • http://skameyki.club/expedia_travel_guide_patagonia7xffu.pdf
    • http://ragukir.iblogger.org/16835599405.pdf
    • https://lazumuron.weebly.com/uploads/1/3/4/8/134863931/kafereg_jamefujotonib_jafiguto_tabekapedalora.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/fejakixoweka/24805590661.pdf
    • http://tosodesuvivat.epizy.com/34460979700.pdf
    • https://s3.amazonaws.com/nisoxow/18937418752.pdf
    • https://s3.amazonaws.com/xipavir/7339143610.pdf
    • https://s3.amazonaws.com/batoragubukepo/short_laboratory_report_example.pdf
    • http://valajawegob.epizy.com/35200417311.pdf
    • http://zarilapaserit.rf.gd/black_baby_boy_names_that_start_with_a_j.pdf
    • http://retobawunabe.rf.gd/80448845229.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_off0000ef1a.bin
9994511db398e32fc20c77283c4ec3c4fb9fe136fb1abae0efa738a3d6bc9fba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1A 5384 bytes
font_01_sfnt_off00010153.bin
e5b3490fd4faa889b4b8e48f477db35e93e3af2c3c5e63749a6d5bc73a12cf51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10153 10580 bytes
font_02_sfnt_off00012598.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12598 4324 bytes

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