Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c70b9300824e81…

MALICIOUS

PDF

71.2 KB Created: 2021-03-23 11:07:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09473befa7be3806e328be3eb8073f5e SHA-1: 942b6271714d2674524674954a4bcdbf383ebdeb SHA-256: 55c70b9300824e8197e40856020904c8dd7722121531d3c1094c49266a98a3fb
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links. The embedded URL 'https://ponafet.ru/123?utm_term=datasheet+capacitor+electrolitico+4700uf' appears to be part of this link farm, masquerading as a datasheet. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/123?utm_term=datasheet+capacitor+electrolitico+4700uf
    • http://felesatediz.medianewsonline.com/dabimewotifewebiwem.pdf
    • https://rixifumalig.weebly.com/uploads/1/3/1/4/131437092/899537.pdf
    • http://emirofficialzm.com/fezovosrsjjp.pdf
    • https://wuxelulomevadi.weebly.com/uploads/1/3/4/9/134904547/1477905.pdf
    • https://barefofu.weebly.com/uploads/1/3/4/4/134492989/xiwifuwolapisep_voworilixazowu_gakut.pdf
    • https://tijirurilulade.weebly.com/uploads/1/3/4/3/134312421/6fb56930.pdf
    • http://mon-cmso.best/117755759193v13b.pdf
    • http://sluzhba1.net/rasibekinavuti1g9w9.pdf
    • http://graatorama.fun/keledaxzr9o4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tiniruru/fovupapiburezonivoxi.pdf
    • https://s3.amazonaws.com/visagogijulep/application_format_for_need_based_scholarship.pdf
    • https://9a1eab6f-da2d-4a41-99bb-18a59f11b130.filesusr.com/ugd/c2b690_6f3983a9d7774551853389c39f4fa17d.pdf?index=true
    • http://girofili.myartsonline.com/hobart_model_1612_meat_slicer.pdf
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_795463a1072c47679451dba0d5ac1770.pdf?index=true
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_b08326c74ced43c89c0a723d2e2d70d5.pdf?index=true
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_b933a7bbbd3348a29e632a389f50db66.pdf?index=true
    • https://s3.amazonaws.com/xakapudakadu/pronouncement_platform_crossword_clue.pdf
    • https://s3.amazonaws.com/gavapozalilup/38597757646.pdf
    • https://s3.amazonaws.com/sobaketemu/47045918802.pdf
    • https://19a39513-20cc-49d1-a75c-e30ce0314142.filesusr.com/ugd/f99735_7781a5e168814e8eab0a447fc0067e33.pdf?index=true
    • https://s3.amazonaws.com/xuxifuzituwu/brawl_stars_mod_apk_android_1_2019.pdf
    • https://s3.amazonaws.com/luworizesupox/miller_syncrowave_250_dx_user_manual.pdf
    • https://s3.amazonaws.com/juduk/21946237742.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_off0000d4bb.bin
bec3399e70f91c0a9fee92186a985663ad3837425d3b5e816150629f5c79b246		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BB 5412 bytes
font_01_sfnt_off0000e734.bin
8def2db7255d64bcbd2e53e894929212061bcaf41d5f86b1c6d5993d66bbfc5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE734 12028 bytes

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