Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a29406c96ecc124…

MALICIOUS

PDF

74.3 KB Created: 2021-06-08 10:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd417a9abc67c87ffa7f753e79c6ea5e SHA-1: d64cd13ee022e7088fc1b7c0ecf3ec78f076cc60 SHA-256: 2a29406c96ecc1247cc7ab2adc5df650d485d27f438b71190df2647b991de267
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 by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards an attempt to direct users to potentially harmful external resources.

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://huntic.ru/pbw?utm_term=how+to+figure+out+wire+gauge+size
    • https://cdn-cms.f-static.net/uploads/4470985/normal_60466f724379c.pdf
    • https://static.s123-cdn-static-d.com/uploads/4381528/normal_60b5e102e24c0.pdf
    • https://cdn-cms.f-static.net/uploads/4369928/normal_602ac6f73134a.pdf
    • https://jegobagugixados.weebly.com/uploads/1/3/4/8/134858953/genutegizarujim.pdf
    • https://cdn-cms.f-static.net/uploads/4499351/normal_603a9bc2a4ae2.pdf
    • https://xadenekowote.weebly.com/uploads/1/3/0/7/130776743/rugot_jogebesipux.pdf
    • https://cdn-cms.f-static.net/uploads/4409096/normal_6054a9f02d0f6.pdf
    • https://cdn-cms.f-static.net/uploads/4403805/normal_6040dcd881d49.pdf
    • https://xubupatulebo.weebly.com/uploads/1/3/4/7/134701573/b957d2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/2b4c5899-ee55-4180-bf27-11113bb2596a/language_in_thought_and_action_chapter_4_summary.pdf
    • https://uploads.strikinglycdn.com/files/4d7e93fb-ae53-426f-a0e4-c89fca860dad/what_an_adversity_score_misses.pdf
    • http://funinupun.pbworks.com/w/file/fetch/144851151/1673775648.pdf
    • https://uploads.strikinglycdn.com/files/400219d1-89f7-4b4e-b73d-ed3fdd973ae9/how_to_set_garage_door_opener_in_bmw_328i.pdf
    • https://uploads.strikinglycdn.com/files/d42ef227-26fd-4cca-97d3-2d3efc83976f/relgio_monitor_cardiaco_garmin_gps_forerunner_35_preto.pdf
    • http://tagexoba.pbworks.com/w/file/fetch/144422652/tojigewujagajij.pdf
    • https://uploads.strikinglycdn.com/files/4e14ea84-0eee-40b6-955f-c10b1b46d733/muforekuwaxonox.pdf
    • http://gopidam.pbworks.com/f/whatsapp_funny_videos_free_download_mp4_in_hindi.pdf
    • https://uploads.strikinglycdn.com/files/f8bcc87d-7717-476d-8027-cf38b0dd52c7/vavofarenabikaxajadero.pdf
    • https://uploads.strikinglycdn.com/files/016dcac1-f2b5-4f83-aa05-95bf22ebcc55/38577368197.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_off0000db41.bin
bf3cb4414c491c79d9d798b62d58e2eb94368ce5ba7e1e10a1b5bcd28471a3df
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB41 4780 bytes
font_01_sfnt_off0000ebb7.bin
41ccb15336e61939be35149b1fce16e574d9451438b8ece0dc06da7c4eb24ea8
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB7 10036 bytes
font_02_sfnt_off00010df3.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF3 4324 bytes