Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf7caeb917fc0d1…

MALICIOUS

PDF

69.3 KB Created: 2021-09-30 21:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6aae7c28e2d642bcc0ec52a4b491b99 SHA-1: 9ba93de309680cf27bb11d760f7370edef55cb78 SHA-256: 9bf7caeb917fc0d1bdbc76ac192e17c93bd2f334b2a2361a21ebab1848a245ca
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristic analysis revealed it functions as a link farm, presenting numerous links to external files, likely to disguise malicious content or distribute malware. The presence of embedded URLs and the structure suggest an attempt to trick users into downloading further payloads, possibly related to game downloads as hinted by one URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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 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://ww150005.linebot.net/upfile/files/20210908132310.pdf
    • http://pk.mo/userfiles/file/65493012480.pdf
    • https://syteq-pro.com/userfiles/file/34818840902.pdf
    • http://sochi-polyana.com/ckfinder/userfiles/files/86315977262.pdf
    • https://sofupingame.net/calisma2/files/uploads/30311761434.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/5464641ce8a441a02f2ac3fa1d942a72/diwugu.pdf
    • http://szakkepzosiklos.hu/upload/file/mudekigagawifijilar.pdf
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/dobutukof.pdf
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/75735297590.pdf
    • http://gerocuki.hu/user/file/komodezet.pdf
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/viwijodabejigekojor.pdf
    • https://tenshinorchids.com/FCKeditor_upload/file/98385836651.pdf
    • http://annabarons.lv/files/files/najufebodatakeferuwelep.pdf
    • http://tysons-cafe.com/uploads/files/junesu.pdf
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/tageduzowipozim.pdf
    • https://termokingbt.com/ckfinder/userfiles/files/pamufegabodovo.pdf
    • https://olivier-daulte.com/ckfinder/userfiles/files/21575014813.pdf
    • http://bjhtdszdh.com/v15/Upload/file/20219291216166927.pdf
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/91986858982.pdf
    • http://abwcolley.com/uploads/files/kajupijeno.pdf
    • http://thaifilmind.com/UserFiles/file/31833238153.pdf
    • http://fioredda.com/userfiles/files/papugomuzemuwudifefodinu.pdf
    • http://riversedgefm.com/files/file/83426683242.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=download+rusted+warfare+apk
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aff4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF4 16792 bytes
font_01_sfnt_off0000c806.bin
a75a1bfe8e22629c4b1cae89f8d1814af09d6d5de92626d58165187565e471d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC806 15308 bytes
font_02_sfnt_off0000eee5.bin
a24132c35f59fcdf3c4ab40909b00d3634d654bfa73784603f1ae6880cd4ff40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE5 10676 bytes

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