Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ee1899d5160fd9…

MALICIOUS

PDF

78.4 KB Created: 2021-05-25 04:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9a7c8431e5a8c65252be7e42eaa8b0c SHA-1: d157c4e329ecba5bbe974c094f9308ac75fed24c SHA-256: b3ee1899d5160fd9ada4f7f9984ca388fcb78c0d48fb4b0caaaee1a42d2bb6ff
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain. The ClamAV detection and ML classifier strongly indicate maliciousness, classifying it as a phishing trojan. The document body, though partially corrupted, suggests a lure related to thermometer usage, which is likely a pretext to drive users to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=how+to+properly+use+a+non+contact+thermometer
    • https://static.s123-cdn-static.com/uploads/4410414/normal_5fcf16c13d450.pdf
    • https://cdn-cms.f-static.net/uploads/4491153/normal_602b6052f24e8.pdf
    • https://cdn-cms.f-static.net/uploads/4505326/normal_604825bbe6817.pdf
    • https://cdn-cms.f-static.net/uploads/4496204/normal_6062d70626a02.pdf
    • https://static.s123-cdn-static.com/uploads/4530323/normal_5fcff308e52ff.pdf
    • https://static.s123-cdn-static.com/uploads/4449629/normal_5ff47b5543eab.pdf
    • https://cdn-cms.f-static.net/uploads/4410006/normal_6012dab78c787.pdf
    • https://cdn-cms.f-static.net/uploads/4474977/normal_603079a1be097.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mikibetiv/gavotokexinududimovap.pdf
    • https://s3.amazonaws.com/tajimipojimo/how_to_set_liftmaster_code.pdf
    • https://s3.amazonaws.com/dazuxujepov/guxovuzosobijujawib.pdf
    • https://s3.amazonaws.com/simujix/18398587172.pdf
    • https://uploads.strikinglycdn.com/files/322d03be-2b46-4c95-b74f-f81263257edf/is_girlboss_based_on_a_true_story.pdf
    • https://s3.amazonaws.com/jokotaziweluge/vijapasunesibadoma.pdf
    • https://s3.amazonaws.com/bejenosugede/chintakayala_ravi_comedy_videos.pdf
    • https://s3.amazonaws.com/gizonukorad/tft_rengar_guide.pdf
    • https://s3.amazonaws.com/zamemigojat/99685851888.pdf
    • https://s3.amazonaws.com/lanaladu/20563326829.pdf
    • https://s3.amazonaws.com/wutezigojuxi/strategy_manager_interview_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/cd529f97-5815-432a-8f17-0eaeed178ac7/dometic_15000_btu_duo_therm_brisk_ii_air.pdf
    • https://s3.amazonaws.com/xefejevife/91828460742.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f493.bin
08aab1d65b00467d6274ce9641ed115bb393c04ac2efbac8f48e30f563a906f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF493 5328 bytes
font_01_sfnt_off0001069a.bin
2891cb9413c4d1fea538fa7e4c1dc9a744076c7e7d2307e8629346f75cae65b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1069A 10804 bytes