Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d582f39adad9fd5…

MALICIOUS

PDF

80.2 KB Created: 2021-04-02 21:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 947b2fe2f0805c7e493aa68bdef05cd9 SHA-1: 12621c0436ad5286cb19dc2bc1f491fe35a0e41e SHA-256: 6d582f39adad9fd5b37c47c9a299b1a5c9c3569ab0cef61f6eec6c1501df89c6
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, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xajibur.ru/strik?utm_term=list+the+14+books+of+apocrypha
    • http://vukufitu.mywebcommunity.org/burkert_6011.pdf
    • https://cdn.sqhk.co/zetoreli/bZET0QL/fifa_brazil_world_cup_2014_game.pdf
    • https://cdn.sqhk.co/nimotixalulo/jjhguDV/polar_roller_coaster.pdf
    • https://cdn.sqhk.co/rojarasam/hhieihI/zipavafisa.pdf
    • https://cdn.sqhk.co/tofatuxurejo/exgciie/69249846380.pdf
    • http://tamakedesununod.mywebcommunity.org/gusezamuzelin.pdf
    • http://fozivot.mypressonline.com/83167558823.pdf
    • http://vijofudevadotar.mywebcommunity.org/pdf_file_software_download_for_pc.pdf
    • https://cdn.sqhk.co/gutipefu/Ihechf1/ice_cream_lyrics_blackpink_selena_gomez.pdf
    • http://javifimawa.mygamesonline.org/critical_thinking_activities_in_patterns_imagery_logic_answers.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_60cda280f2f9485489fcb507d9381693.pdf?index=true
    • http://mujebik.atwebpages.com/fda_medical_device_classification.pdf
    • https://uploads.strikinglycdn.com/files/0831789d-e881-4638-97d6-6e99dd93194a/12269429976.pdf
    • https://uploads.strikinglycdn.com/files/7b9df09a-97e4-4477-b0a8-a19e2aa6c61e/reading_comprehension_worksheets_year_5.pdf
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_0e7f57fc44c24b1ab57dbfd248648e92.pdf?index=true
    • https://0dc5fd1c-b354-4e5b-9ccd-45395e8994ed.filesusr.com/ugd/f79e8d_c2577d51b42f4f9fa197aba4b42c1c42.pdf?index=true
    • https://s3.amazonaws.com/fujadabez/beats_solo_3_comfort_review.pdf
    • https://s3.amazonaws.com/dobesogum/egyptian_cotton_bed_sheets.pdf
    • http://vekemelegewimo.atwebpages.com/how_to_use_bosch_1617_plunge_router.pdf
    • http://ketabigumowun.atwebpages.com/73847528527.pdf
    • http://batapijas.myartsonline.com/durable_power_of_attorney_virginia.pdf
    • http://satawakerexe.atwebpages.com/char_broil_4_burner_gas_grill_prices.pdf
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_ac43a75b19174166bdb9f969ce96ffb7.pdf?index=true
    • https://s3.amazonaws.com/kijelopazekune/how_much_zaxbys_pay_an_hour.pdf
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_f1961242b9204a5e985d9cd4d60d3c41.pdf?index=true
    • 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_off0000fcb5.bin
a91091e43ba5bddc52a3a02cdb1d0fc2dcaed89133207ec25060a78b02465ce2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB5 5460 bytes
font_01_sfnt_off00010f56.bin
770bfb61602450eb9ab86dcd68ae0eadb1d63829ab1076b9579f1c2d6b865859		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F56 10448 bytes

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