Malicious PDF — malware analysis report

Static analysis result for SHA-256 87613970a7d68111…

MALICIOUS

PDF

75.0 KB Created: 2021-03-27 23:55:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43c44abc01fc49b33ebbf1bcee5a990a SHA-1: a74ac9f8c952397110c92f02896796e78fbed3f5 SHA-256: 87613970a7d68111065fab757b97800a6c33530f727211479858dcc0b35b6d40
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing or tech-support scam pattern, suggesting the document's content is designed to trick the user into making a phone call. The embedded URL 'https://pelibifir.ru/aws?utm_term=urban+farmer+the+nines+portland' is a primary indicator of the malicious infrastructure used.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/aws?utm_term=urban+farmer+the+nines+portland
    • https://wexarasi.weebly.com/uploads/1/3/4/3/134351888/mikatilefog_lenemo_webesazuxeko.pdf
    • https://sasopezanureje.weebly.com/uploads/1/3/4/6/134691995/jitilediwa.pdf
    • https://panelaxefejavej.weebly.com/uploads/1/3/5/3/135306159/tevuka-rasufusipajivo-faduvu.pdf
    • https://cdn-cms.f-static.net/uploads/4459791/normal_60264101a5dc6.pdf
    • http://ridaxaki.mywebcommunity.org/guitar_chords_chart_printable.pdf
    • http://manamuposa.getenjoyment.net/nibupelotuberadawatavido.pdf
    • http://wowogobofomufu.mygamesonline.org/saxozuvefipibigixew.pdf
    • https://cdn-cms.f-static.net/uploads/4423429/normal_5fda5060b10ab.pdf
    • https://duxudalo.weebly.com/uploads/1/3/4/8/134866109/7eb49b.pdf
    • https://jebezijako.weebly.com/uploads/1/3/5/9/135964749/7bcf0ade7e.pdf
    • http://gefosezidubajoz.scienceontheweb.net/which_is_the_best_boss_delay_pedal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fejakixoweka/bazujasu.pdf
    • http://pusapovewazigu.onlinewebshop.net/38491658254.pdf
    • https://s3.amazonaws.com/wuwabobujasivor/7655782407.pdf
    • https://s3.amazonaws.com/ropidadegaxut/how_to_clean_harman_xxv_pellet_stove.pdf
    • http://lazuletezofik.onlinewebshop.net/tusiwominizanunag.pdf
    • https://uploads.strikinglycdn.com/files/64a90837-72f4-40dd-a673-cb74464645fb/can_you_record_on_xfinity_without_dvr.pdf
    • https://uploads.strikinglycdn.com/files/6d598eab-ba0f-45c8-8b07-49da233d758d/the_bible_is_the_living_word_of_god_verse.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_off0000e629.bin
9e6d30b84b9500a41739200e3aacd4b4fd4c86869f78d98f1d1d4c38b586d583		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE629 5412 bytes
font_01_sfnt_off0000f863.bin
5da2e5d28b4eca8bc94b91164fa8713a329c40b1b3b009ae06b049eac4fc3649		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF863 11656 bytes

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