Malicious PDF — malware analysis report

Static analysis result for SHA-256 02130b912af49478…

MALICIOUS

PDF

75.4 KB Created: 2021-05-22 01:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05b21bb11a01ed10e5d15759de137bad SHA-1: 262a26039c83f7b8f5af3717dc085091804016e3 SHA-256: 02130b912af49478223072c1f537bab2e7d3abf79b054fe2e21fd7f695b0b156
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM' and another detecting an external URI. The primary malicious URL identified is dafemum.ru. ClamAV also detected this as Pdf.Phishing.Trojan, indicating a phishing or trojan distribution intent.

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://dafemum.ru/strik?utm_term=can+knees+go+past+toes+when+squatting
    • https://gawozigojuvapa.weebly.com/uploads/1/3/4/8/134896601/2297899.pdf
    • https://gusijanuvo.weebly.com/uploads/1/3/0/8/130874241/5d2e0c84fe94.pdf
    • https://nubeboganiroj.weebly.com/uploads/1/3/1/3/131384383/3105222.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4406237e-e5b1-489c-bb0c-6e394f3f7e2f/why_is_my_sewing_machine_not_moving.pdf
    • https://uploads.strikinglycdn.com/files/3040476b-6560-4455-8aa8-3869356edb9b/teronulesenedesar.pdf
    • https://s3.amazonaws.com/viromibukoleliw/vampire_hunter_d_novel_volume_1.pdf
    • https://s3.amazonaws.com/poresi/gusurozibubimuvuviwoxulom.pdf
    • https://s3.amazonaws.com/legobegutulo/netgear_wnr1000v3_wireless_bridge.pdf
    • https://s3.amazonaws.com/daxemo/beginner_piano_christmas_songs.pdf
    • https://s3.amazonaws.com/zasepo/moviesda_in_2019_hollywood_movie.pdf
    • https://uploads.strikinglycdn.com/files/392e5bb2-7b24-45de-b106-8534bf8ecd12/bebejefiter.pdf
    • https://uploads.strikinglycdn.com/files/03527379-3207-42b9-97bf-5644ec3b565b/why_is_hajj_one_of_the_five_pillars.pdf
    • https://uploads.strikinglycdn.com/files/5e0dc9fb-f0c0-4c9b-8438-1ea5a4d39032/cyberpunk_2077_deadeye_mod_not_working.pdf
    • https://s3.amazonaws.com/tosevud/cpu_performance_benchmark_test.pdf
    • https://uploads.strikinglycdn.com/files/9335286a-a4d0-4644-92a3-cc4fb6eb385f/berserk_manga_chapter_83.pdf
    • https://s3.amazonaws.com/gofiguj/download_primavera_p6.pdf
    • https://uploads.strikinglycdn.com/files/c80406e5-74f7-4f13-9df7-948a9a1ec96c/wojize.pdf
    • https://s3.amazonaws.com/lakadutof/how_do_you_heat_up_maggianos_take_home_lasagna.pdf
    • https://s3.amazonaws.com/xetasif/89135133863.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_off0000eab6.bin
9561e58a68052dd12105c5adff734b1abe76d5e8f60f119d01ad01c63cd3f76b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB6 5140 bytes
font_01_sfnt_off0000fc4b.bin
10b7ec2bb23251c80edab174ff05458b25d85e8f13256ce7b56f2fefe4725295		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4B 10492 bytes

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