Malicious PDF — malware analysis report

Static analysis result for SHA-256 40136c6554748dc6…

MALICIOUS

PDF

89.8 KB Created: 2021-02-18 13:13:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 7cdc078079310470e0c81367413aff1a SHA-1: e7b88dcbfc6c145714bb0152d73658104084cb7c SHA-256: 40136c6554748dc6c33a84c4c464a28ffba52e71dd03955e2b6aeaefa270342f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://baarspo.ru/strik?utm_term=what+type+of+spark+plug+does+a+briggs+and+stratton', is suspicious and likely leads to a phishing or malware distribution site. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://baarspo.ru/strik?utm_term=what+type+of+spark+plug+does+a+briggs+and+stratton PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490264/normal_6013d81c268b0.pdfIn PDF document text
    • http://kugezuxabomo.iblogger.org/dell_precision_t1700_weight.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489240/normal_6028b4790bae7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456984/normal_5fccd9444008c.pdfIn PDF document text
    • https://mebedepubini.weebly.com/uploads/1/3/0/8/130813558/fb19bb78a4c60e8.pdfIn PDF document text
    • https://lubefapezixa.weebly.com/uploads/1/3/1/3/131398117/tovititot.pdfIn PDF document text
    • http://gifozuxozud.22web.org/higher_or_lower_game_answers_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370273/normal_601e8b3bb59c6.pdfIn PDF document text
    • http://wowonofejubudib.iblogger.org/template_html_simple_responsive.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/topipovikapari/53471523010.pdfIn PDF document text
    • http://tajazeruviv.rf.gd/bhagwan_dada_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/57949427284.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/samsung_j400f_flash_file.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/essentials_of_understanding_abnormal_behavior.pdfIn PDF document text
    • http://bisiziwaros.epizy.com/beretta_92x_performance_forum.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/jalumofux.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/evermotion_archinteriors_vol_44.pdfIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D2 5504 bytes
SHA-256: 4b73491a05a91f6e8c273de40e3921d2528ed952d53dc4a36ada0e6b2c8ceedd
font_01_sfnt_off00012593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12593 11240 bytes
SHA-256: f9dbf65d9d3fdd62b6b53d63be3f19cb2392f17df514603e327e34de59b93c26
font_02_sfnt_off00014b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B5D 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

Open this report in the interactive analyzer, or submit your own file for analysis.