Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bdfbe4c3d09ada1…

MALICIOUS

PDF

110.0 KB Created: 2021-03-12 19:25:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d6f38b06f2f54c28d66316afa5070f5 SHA-1: 55cbad465b7bfd222f345e04674b9ef407fc9c95 SHA-256: 3bdfbe4c3d09ada1018e8b897effb3decc7277f5c982d7e1add7119cba388cf0
164 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many of which are disguised as legitimate documents or media, indicating a link farm designed to obscure malicious activity. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/123?utm_term=padman+full+movie++bestwap
    • https://cdn.sqhk.co/gotevobogefa/ggrIthe/brother_printer_hl_l2321d_driver.pdf
    • https://cdn.sqhk.co/pigajifaw/gdPlFii/77793851920.pdf
    • https://cdn.sqhk.co/bemaxopig/1LLMMgi/32133510166.pdf
    • https://cdn.sqhk.co/sudofeno/fAIja7u/islamic_daycare_calgary.pdf
    • https://cdn.sqhk.co/jasurisunav/g9jaDjg/free_picture_collage_maker_for_facebook.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pirofopafu/edgeswitch_5xp_datasheet.pdf
    • https://s3.amazonaws.com/nuselufuzo/alita_battle_angel_2_mp4.pdf
    • https://s3.amazonaws.com/nakevoja/vaccine_fridge_temperature_record_sheet.pdf
    • https://uploads.strikinglycdn.com/files/18a165f2-f01d-4161-8224-dd85ed13934a/63639782432.pdf
    • https://uploads.strikinglycdn.com/files/69656aab-41a0-4f87-a784-02183d73dd54/lakshmi_narasimha_karavalamba_stotram_meaning_in_telugu.pdf
    • https://s3.amazonaws.com/pidufozu/mammogram_guidelines_acog.pdf
    • https://s3.amazonaws.com/busutafitufe/miwutipafoguketukipoxenuv.pdf
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_90def086f703437aaf07c9fed5df786e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/90d82690-3369-4433-b99c-9b66ca5f6ab1/92613404907.pdf
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_c7ac6196c5e84f1498bc50dced923f75.pdf?index=true
    • https://s3.amazonaws.com/takateg/90016281978.pdf
    • https://s3.amazonaws.com/libosokune/81019861949.pdf
    • https://s3.amazonaws.com/wobuzisibal/bleacher_report_nba_starting_lineups.pdf
    • https://s3.amazonaws.com/lupuvogotog/befelididorotosegotawoz.pdf
    • https://s3.amazonaws.com/sorogamat/kidde_smoke_alarm_beeps_every_15_minutes.pdf
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_66e033ecd25c4eef88cd0cc2e17b54e0.pdf?index=true
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_f25f06db17e2496999552cc0633f3ae4.pdf?index=true
    • https://s3.amazonaws.com/vidadaviwal/what_are_the_challenges_of_environmental_ethics.pdf
    • https://s3.amazonaws.com/dugibabafod/dagubefusogakumel.pdf
    • https://s3.amazonaws.com/sasufufa/wow_classic_lockpicking_guide_wowhead.pdf
    • https://s3.amazonaws.com/wokesabisevo/notoguzukopemijirefe.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012bd7.bin
c6be75ebdba514ac90d106c7fea08c9c967471012cd5929a4e94a34139c48a71
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD7 13112 bytes
font_01_sfnt_off00015719.bin
0aeab54215936d895dee6f487ce24bb1b5992722ffb8a7b2b0a92147f5edb727
pdf-font-stream PDF embedded font (sfnt) at offset 0x15719 5384 bytes
font_02_sfnt_off00016976.bin
c836e543483495097971c886c1d1c5186b4af39035696cc61a451b6be5d90d0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x16976 13484 bytes
font_03_sfnt_off0001949a.bin
6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1949A 16164 bytes