Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f3861cf75a4cb1…

MALICIOUS

PDF

88.8 KB Created: 2021-02-16 21:21:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: cc9f60a04b819fe6e13c3ed071fb45fe SHA-1: dfc20c00bac4ed6bf1d01211e0aac8553ef39fed SHA-256: 83f3861cf75a4cb120e6ba280dd0b86ef62e7371ef1fa6d64447d05767045478
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on external services. One of these URLs, https://maypoin.ru/strik, is directly embedded and likely serves as a redirector to malicious content. The ClamAV detection and ML classifier further confirm the malicious nature of the file, indicating it's a phishing or trojan distribution attempt.

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://maypoin.ru/strik?utm_term=me+before+you+netflix+america PDF link annotation
    • https://waperimawomexav.weebly.com/uploads/1/3/4/7/134733778/xenogi_vuwumif_vagirexap_lonitigavusobu.pdfIn PDF document text
    • https://cdn.sqhk.co/bupedamarib/gewwvyW/94370110337.pdfIn PDF document text
    • http://tesocoin.online/dual_adjustable_bed_sheets76ox9.pdfIn PDF document text
    • https://xalifabosivibu.weebly.com/uploads/1/3/0/7/130775217/02fd5fa.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/pjdhcJb/bandicam_recorder_reviews.pdfIn PDF document text
    • http://hugertely.xyz/andeavor_corporation_annual_reportfxf2k.pdfIn PDF document text
    • https://cdn.sqhk.co/fusaduxuw/jg3L11r/fall_guy_game_review.pdfIn PDF document text
    • https://cdn.sqhk.co/baxajufim/6J1jege/wakedemunexuzojetolire.pdfIn PDF document text
    • https://rodugetimevo.weebly.com/uploads/1/3/1/4/131407281/83037d4.pdfIn PDF document text
    • https://cdn.sqhk.co/lakivasulis/gjj9IvV/94977765966.pdfIn PDF document text
    • http://reduslim-ufficiale.website/ese_no_es_mi_problema_videou6bk4.pdfIn PDF document text
    • http://idealslimitalia-official.site/die_bergdoktor_episodenguidewlgbd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kafises/42474155540.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/werejudizarikorosakatiwen.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/nonigajil.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/towipivewokaru.pdfIn PDF document text
    • http://wibekemuxeni.epizy.com/best_android_games_with_good_graphics.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/94677306377.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/60336326696.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/42677278814.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/hydrolyst_warframe_guide.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12056 5164 bytes
SHA-256: eb46efcf143ce85300c2e8f56d7f1f0416b0af831c72a1cd2e4182490065b833
font_01_sfnt_off000131ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131ED 10348 bytes
SHA-256: 64b2844d67afd7fcad43779687f6cdf2320dacdc32e8201c07b48818cc724757

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