Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9cafce9dc794b09…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 19:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0df118278a4bd4c003349fa9b095a342 SHA-1: 2fd4a6e8b63d1c9215ae7c7f685fbd48fd578201 SHA-256: b9cafce9dc794b094c2884b0362408f0a7baf2a3373019d7fd0c81bbef0c9cdb
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

This PDF file was flagged as malicious by ML classifiers and ClamAV. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a shell, a common technique for executing malicious commands. While no scripts were directly extracted, the presence of numerous embedded URLs suggests a phishing or credential harvesting attempt, potentially leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 http://yalcinsezer.com/upload/ckfinder/files/kexogufotavapax.pdf
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/dixepebevakudowusa.pdf
    • https://radio-aurea.eu/files/file/1281652478.pdf
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/67532147846.pdf
    • http://intersonik.eu/upload/files/wewivilur.pdf
    • http://maekuangudomthara.com/ckfinder/userfiles/files/tezifaje.pdf
    • http://sjzhtchem.com/upload/files/93952896198.pdf
    • http://sfssolution.com/userfiles/file/sovelorifedelebeko.pdf
    • http://turksebruiloften.nl/userfiles/file/87258844405.pdf
    • https://armagedonspedycja.pl/files/file/95444762357.pdf
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/47911841443.pdf
    • https://marlin-shop.ru/ckfinder/userfiles/files/55166143352.pdf
    • http://elma-itc.ru/!upload/files/21615166644.pdf
    • http://asu78.ru/userfiles/file/30468017315.pdf
    • http://snuhonors.com/userfiles/file/lijubimixekojuxotanamedis.pdf
    • https://premium-house.uz/images/file/segugemumilujubopudu.pdf
    • https://lordoptika.hu/files/files/65105201584.pdf
    • https://grupa-energia.pl/attachments/file/29910359323.pdf
    • http://elmbbq.com/uploads/files/xodupu.pdf
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/59504158490.pdf
    • http://traslochimontalto.it/userfiles/files/59589294800.pdf
    • http://hnhappiness.com/d/files/jejotidufewij.pdf
    • http://aczelzalog.hu/tmp/47936315333.pdf
    • https://kimcert.com/E/file/49699591063.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ubuntu+os+for+android
    • 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_off0000de05.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE05 16792 bytes
font_01_sfnt_off0000f617.bin
df9f2f80f73038b1a1be3140788c1b97f70cf126ecfd4da10416f67727bbe199		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF617 17504 bytes
font_02_sfnt_off000122d4.bin
b56f73955852de7f3f2205029361f8767f80e6cc6bbc162d16d4867e7eb166ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122D4 10416 bytes

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