Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d9a68b35ce73039…

MALICIOUS

PDF

74.2 KB Created: 2021-05-30 12:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d9786324e5341c53d575fadf4c66d010 SHA-1: c3845745fdc63d147516805971b359480a848f75 SHA-256: 9d9a68b35ce730397e7f6bcd4b481806df7bfd5f052094d7e8415c5dfc5afb9e
186 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 high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains text related to 'minecraft alpha version' and 'wkhtmltopdf', which is likely a lure to direct users to malicious URLs such as https://jacksth.ru/strik. The presence of embedded URLs and the overall structure point towards a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=how+to+play+minecraft+alpha+version PDF link annotation
    • https://jatufabafalili.weebly.com/uploads/1/3/1/6/131637938/kabuv.pdfIn PDF document text
    • https://kudokazapa.weebly.com/uploads/1/3/1/4/131452939/zafonubixojafa.pdfIn PDF document text
    • https://guzifako.weebly.com/uploads/1/3/4/0/134096492/fijafupubowamuxata.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484997/normal_603fb98e7461d.pdfIn PDF document text
    • https://sojabejob.weebly.com/uploads/1/3/4/8/134890412/f7f5a61765b670.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485457/normal_5fced6fb2cddb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489979/normal_606af55dc3d0c.pdfIn PDF document text
    • https://lokuzovitopoz.weebly.com/uploads/1/3/4/8/134871506/xemoluj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382408/normal_6052c4adb8a9d.pdfIn PDF document text
    • https://ziruxirunilexa.weebly.com/uploads/1/3/0/7/130775543/9494539.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494165/normal_602b95dacb0bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490138/normal_5ffb7c95579f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366014/normal_600704c6e3173.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378619/normal_601a2c83b1975.pdfIn PDF document text
    • https://gowajepev.weebly.com/uploads/1/3/4/9/134900038/4924956.pdfIn PDF document text
    • https://pepotojil.weebly.com/uploads/1/3/4/9/134900045/linejukofileb.pdfIn PDF document text
    • https://funegetoxa.weebly.com/uploads/1/3/4/7/134742159/zunelitomexakuf-nepibewuna-gidaludoritek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e0b54aa-113a-42af-9a97-ad1f2cce7e2e/duraflame_fireplace_heater_keeps_shutting_off.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35debe72-27b8-4754-9a46-448532b88c3d/98062353539.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4c85ccf-b656-4ff0-9f2c-a03e58eeac3a/best_hikvision_nvr_16_channel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a969c86-245c-44d2-b826-1f29fdef9099/samsung_grand_prime_plus_display_price_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9766a67-c91a-490d-822b-9c978a84934f/86800363139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79fbec4c-23a7-4ea3-a08d-44e4e64fc9ef/thirteen_reasons_why_season_3_trailer_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18ec2aac-8df6-4f9a-a228-802d35605c3b/92515039619.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5cabc69-282c-422f-80e2-dc5d52e0f243/how_to_reset_asus_rt-n12.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea57beb4-1150-4a1c-9a63-22f1473a3236/when_to_start_sat_prep_classes.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_off0000e132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE132 5472 bytes
SHA-256: 16be0b426e75b9bb310c77e6c08592200c4d21bf1b3d5388399afc96c5475f2f
font_01_sfnt_off0000f3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BF 11520 bytes
SHA-256: 4359f74b5a700638ad204b92a70d3379adbd1fdf63ae66a6cb0b08e659ce109c

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