Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed52478a386869a…

MALICIOUS

PDF

78.8 KB Created: 2021-03-20 19:58:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98fa534ff3facc18915843489e2cd8ff SHA-1: 28f7914864c1f4cd829375445df481bc452338f2 SHA-256: 3ed52478a386869adc5ff7311eb54b05adcb2ea54f975d4b85a2faa26669dd78
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous external links, with one prominent link pointing to 'https://pelibifir.ru/wix?keyword=costway+ice+machine+manual', suggesting a lure to a potentially malicious website. The presence of many external links, some pointing to benign files and others to unknown destinations, indicates a link farm or redirection strategy common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/wix?keyword=costway+ice+machine+manual
    • http://jigatinapa.22web.org/drosophila_experiment_lab_report.pdf
    • http://lnstagramverifiedbadgeservice.com/8267686267164xdc.pdf
    • http://bestunew.xyz/55261673035opwhe.pdf
    • http://help-feedback-amzn6.xyz/figuvemixwouct.pdf
    • http://nasty666.space/32477899562uek5b.pdf
    • http://goossyy.online/631830601972y66a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://de26864d-dd79-4a6d-8467-b5cf435a6969.filesusr.com/ugd/6ff07c_702a604a7afc4a25881e91e53fcd3241.pdf?index=true
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_1e1093c83eb448e6b6975b6023c164e4.pdf?index=true
    • https://s3.amazonaws.com/lonozote/bombsquad_pro_apk_free.pdf
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_addcb5d031cc49089bafc9c80129380e.pdf?index=true
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_b3df4046b37c40fc95f5b28e490d5ecc.pdf?index=true
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_bb07eb50f8e94dffa47d571bf3609e6b.pdf?index=true
    • http://ribikusilotagod.rf.gd/baroque_form_synonym.pdf
    • https://s3.amazonaws.com/jiwotarotavuz/year_2_time_worksheets_free.pdf
    • https://s3.amazonaws.com/kumasala/24844692751.pdf
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_ff59271ec005477e94237842c667d4ca.pdf?index=true
    • https://19a39513-20cc-49d1-a75c-e30ce0314142.filesusr.com/ugd/f99735_3807cdb5d98d448f940c7341d8ecf508.pdf?index=true
    • https://s3.amazonaws.com/faduxodiwo/44521765709.pdf
    • https://8569cc17-8b2a-4187-ace0-95b0550b99f0.filesusr.com/ugd/d6eede_543bc523085345c992c6e5933af07729.pdf?index=true
    • https://s3.amazonaws.com/rurosaveruk/zowajawol.pdf
    • https://s3.amazonaws.com/nafoxuda/crossword_censure_informally.pdf
    • https://e25b7b56-d8f7-44cb-9276-56428e53d1cc.filesusr.com/ugd/63f3e8_bce14bce1d6e442985e927f139890b90.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_off0000f6b6.bin
16a216f86eb792318ba58d4063b3ef382bed0d236cf0f00914337b9776b445e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 5040 bytes
font_01_sfnt_off000107ce.bin
eae5ac4d825dbf2e305405bd76eaf88aabc61da85069e64fdfb0b5df65f23671		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107CE 11288 bytes

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