Malicious PDF — malware analysis report

Static analysis result for SHA-256 b119ce2daa771663…

MALICIOUS

PDF

73.7 KB Created: 2021-05-25 16:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 602f637735bb010f1cc7e561e45c82e4 SHA-1: 0e8f28c0e1342d33916321bddc3d6b8c0d0d0cab SHA-256: b119ce2daa7716636cc7e6d177829051b5da8d4d8096bbff28b6a2d181011bed
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'golowaki.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'Fractions practice puzzles answer key'. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/strik?utm_term=fractions+practice+puzzles+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426966/normal_601c9551385aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366040/normal_600c001d988f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479942/normal_5fd64c4ced948.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376374/normal_5ffcaf6874c28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469850/normal_5fe6c14065e25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426823/normal_60199a6570330.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417123/normal_605ab822b38c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368222/normal_5fe2b14dab200.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://uploads.strikinglycdn.com/files/f5c8c06a-6479-4dd7-b80c-e1a09ecba32e/gravity_falls_journal_3_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d33d06ff-500d-405a-92db-ff585c1acaca/vodibij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1dc21db-f780-4f3e-aaf2-8a125a9359b5/subway_fast_food_nutrition_facts_calories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a172a83-3085-4a65-9efc-ec3366f44067/the_hidden_oracle_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/275c5eaf-acef-4179-a868-0c06aad88f70/what_is_the_main_idea_of_the_short_story_the_lottery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9711230-c181-4ec5-9f67-63f64404725c/19685814583.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/60924967415.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/59972821990.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_off0000d5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E9 5072 bytes
SHA-256: 9d6b6cb26d5a214785ccb16f1da439152d8ddac881c76fa0d316a1e74d0bc371
font_01_sfnt_off0000e754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE754 10624 bytes
SHA-256: 7fd37867dc148c8ef06606465f8bf13c9172262359701140742be87cddd82eb8
font_02_sfnt_off00010bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC8 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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