Malicious PDF — malware analysis report

Static analysis result for SHA-256 250143302800330f…

MALICIOUS

PDF

74.7 KB Created: 2021-03-27 20:50:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ad4550133025b5253d8c9998c04dfc23 SHA-1: 344660d14a249782a9b076190c675bc5accba044 SHA-256: 250143302800330f57c84d6339f6159597bd7b516424a1943c3c4f1b79e80858
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 domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains a title related to immigration processing, likely a lure to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=how+long+to+wait+for+i-130+approval PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456687/normal_6038092727dd1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377113/normal_600743b3b1f54.pdfIn PDF document text
    • https://cdn.sqhk.co/dukoredod/fMbjghD/g_force_race_suit.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/DpYcjfb/56155887830.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448110/normal_602aa4be50673.pdfIn PDF document text
    • https://sajosapisede.weebly.com/uploads/1/3/4/3/134344890/4732547.pdfIn PDF document text
    • https://cdn.sqhk.co/mojupesonon/qqhbghg/22916750485.pdfIn PDF document text
    • https://cdn.sqhk.co/bimerolu/KhbTjfE/50342193303.pdfIn PDF document text
    • https://xebuzoxovekig.weebly.com/uploads/1/3/4/0/134018553/bulimukusiwaxe.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/61a17e3e-fcc9-4552-a619-ab26be2e9a76/1_police_plaza_nyc_property_clerk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b0f21c5-bcac-4436-a8f8-39b272a63b35/xanuderowumogefegovug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28bd5fc7-2f27-4dbe-adc5-cce655d0dffc/67787820709.pdfIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_9891c018c7b44ef091728e1fd6f044a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/02aa40b4-b21d-45e8-af9e-c000fc6e27b4/galaxy_a10e_price_unlocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bfa7022-93e8-40b2-9302-da10f085ec0e/mulikilewewipolis.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/jofumigakivewibowupizubu.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/19928231971.pdfIn PDF document text
    • https://183df7f2-4185-4ca0-bfcc-33b39bc842f1.filesusr.com/ugd/9ac34a_3a7b374b6b1a45baba2dad9b366c0fc3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/baseball_score_sheet_abbreviations.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/best_rb_ballads_of_the_2000s.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_off0000e556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE556 5396 bytes
SHA-256: 4d54457207b187c376c228f532af5498eb9240608944869253dabf2a2f9182a0
font_01_sfnt_off0000f7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7ED 10972 bytes
SHA-256: 4471ced92a38e1ffd421da1dc650f5fb18ba3d5dc3654ea3a520149e0e95ef1f