Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a2c5c6250c8792…

MALICIOUS

PDF

83.7 KB Created: 2021-03-10 15:58:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 2ad80849205b7bffb4affc7cff031866 SHA-1: 0d3b32acc4fb42ea9fa4b4347fa11933f11a78b4 SHA-256: a8a2c5c6250c8792d5a95cd222b97bbb534dc6fd3d05d47f85ffa9c262e7f083
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xezojetit.ru/strik?utm_term=what+are+the+congruence+theorems+for+triangles PDF link annotation
    • http://forsage.pw/which_is_the_largest_economy_in_indiawllkp.pdfIn PDF document text
    • http://fixmarker.fun/the_cask_of_amontillado_vocabulary_practice_worksheet_answerso7if0.pdfIn PDF document text
    • https://pusesame.weebly.com/uploads/1/3/4/6/134662227/3235c01168d1d4.pdfIn PDF document text
    • https://dodesurazuxosa.weebly.com/uploads/1/3/4/3/134382101/4cdd396ef0e6.pdfIn PDF document text
    • http://pitushok.fun/star_wars_quiz_questions_and_answers_2020hbwoh.pdfIn PDF document text
    • http://reggis.info/valudigepawulizel4xivk.pdfIn PDF document text
    • http://drovazvenigorod.ru/xinomokum4gxmz.pdfIn PDF document text
    • https://mefewenitili.weebly.com/uploads/1/3/1/3/131379946/vagurokediriw.pdfIn PDF document text
    • http://rodsfish.club/13948828195y4shu.pdfIn PDF document text
    • https://movakesomerinid.weebly.com/uploads/1/3/4/5/134528648/netodijexowo-vadaj.pdfIn PDF document text
    • http://rikumoturukeju.iblogger.org/destiny_2_light_level_guide_forsaken.pdfIn PDF document text
    • http://a1metromovers.com/863288617775zrh.pdfIn PDF document text
    • https://lukuxafibufogi.weebly.com/uploads/1/3/5/4/135400428/3233750.pdfIn PDF document text
    • https://loxuvamozevu.weebly.com/uploads/1/3/4/3/134310095/94a5a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_045948cc0a4d4835919ffa552ce8981a.pdf?index=trueIn PDF document text
    • http://vusurides.rf.gd/where_are_ac_fuses_located.pdfIn PDF document text
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_af6c77b60e394c45a108443c687facfc.pdf?index=trueIn PDF document text
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_dbfd260d5ae24f91a47afcb5138de382.pdf?index=trueIn PDF document text
    • http://runoxujozu.rf.gd/pedawaveneka.pdfIn PDF document text
    • https://2a50e20e-73b4-464c-af53-7ac4f68fee21.filesusr.com/ugd/7dd30d_be9ba159568646168b1f9967d5202dca.pdf?index=trueIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_2b93a1657c964246aafc6658f0606478.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BB 5308 bytes
SHA-256: cfad361b9654f1ce954846025d2f6ed31da501683c392e0f52e36c4b29a16b1f
font_01_sfnt_off000104ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AD 11244 bytes
SHA-256: 66459106a774486e54d1858a3fda74038145141f9dffa22b3df432374ad4c88a
font_02_sfnt_off00012b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B65 16256 bytes
SHA-256: b6a375b1d38f5b5e8ac66c8fad3f11852c7f5ab3e687b973d1e5f12c56475e64