Malicious PDF — malware analysis report

Static analysis result for SHA-256 526adb533800644b…

MALICIOUS

PDF

77.0 KB Created: 2021-03-04 23:27:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0978452b3a3b1995968e954a5ccf9dc SHA-1: e6e0b4492304d9daa59b7bb6dc6d6a891005e6bf SHA-256: 526adb533800644b7ee8cd827715e84676ed78b7388965362f9c8e9834a35624
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'gimoguvi.ru', which is likely part of the attack chain. The document body is heavily obfuscated, but the presence of external URIs and the overall detection suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/aws?utm_term=what+is+a+big+word+for+alliance
    • http://xokewekababawa.22web.org/cultivo_de_cebolla_china.pdf
    • https://cdn-cms.f-static.net/uploads/4387054/normal_601000f64ad6b.pdf
    • https://cdn-cms.f-static.net/uploads/4483082/normal_603c2707d50d4.pdf
    • https://static.s123-cdn-static.com/uploads/4444882/normal_5fddb183f3e67.pdf
    • https://cdn-cms.f-static.net/uploads/4451929/normal_5fe62becc4d65.pdf
    • http://salearea.pro/you_mean_the_world_to_me_lyrics_toni_braxton62qyd.pdf
    • https://static.s123-cdn-static.com/uploads/4447270/normal_5fe2749c677e8.pdf
    • http://dlkmvkoenv.info/61062474920sqyj.pdf
    • https://cdn-cms.f-static.net/uploads/4366041/normal_6023bc2a9da58.pdf
    • http://ulekschool.online/78443065387owsbw.pdf
    • http://new-volosi.ru/girixajixidokoxokodomerixeo41.pdf
    • http://argo-tourism.com/what_do_the_12_traditions_of_aa_meaneq3ix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tikoweravisixu/the_ransom_of_red_chief_audio.pdf
    • https://s3.amazonaws.com/jidosatikim/vokikurusar.pdf
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_bfdca4bfcb184363a43c109ac11a6112.pdf?index=true
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_db2659e89b6b48648bf627879351253e.pdf?index=true
    • https://s3.amazonaws.com/mejados/the_ugly_duckling_worksheets.pdf
    • http://tinejamuwaki.epizy.com/regents_organic_chemistry_review_sheet.pdf
    • https://010f2e21-25ca-4560-806d-08cbbb7c7db1.filesusr.com/ugd/74a852_e18f65de0d2a45e4bf03fc2108d54346.pdf?index=true
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_7524647e2bf9478b862849d943f099cf.pdf?index=true
    • https://s3.amazonaws.com/gadumagabusodel/21278547839.pdf
    • https://s3.amazonaws.com/julexekubaj/bujiwu.pdf
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_28eab5cd7f9d4b19bd3c6bb027b578d0.pdf?index=true
    • 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_off0000edb9.bin
02e9211312ea9da5e316ec7c3e92904da053ed5b0d10bf6a508ff662cc14317d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB9 5528 bytes
font_01_sfnt_off00010094.bin
a2bf1dfc71b91c3360013ab46fcd4cd31e219493328d76d6cce3ac1cd7c90354		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10094 11384 bytes

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