Malicious PDF — malware analysis report

Static analysis result for SHA-256 deeaf6ec6fb1fdbb…

MALICIOUS

PDF

124.0 KB Created: 2021-05-10 03:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: fb323ee79eca0a2a235ddd69ac18e27b SHA-1: be438e49bd8d66e3f6559b04a38ccc78691c6f6b SHA-256: deeaf6ec6fb1fdbb0e734579bdd0af2c09e38f19b41c8db4d7d9e611537f1a2c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, many of which are disposable or unknown. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive link farm suggest an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://lozipotod.ru/strik?utm_term=what+is+monstrous PDF link annotation
    • http://pifadopagel.scienceontheweb.net/22928605253.pdfIn PDF document text
    • http://reawolt.online/71874062891mp6uq.pdfIn PDF document text
    • https://lufegema.weebly.com/uploads/1/3/4/1/134132410/poropubafa.pdfIn PDF document text
    • http://zhk-rekord.info/how_to_use_convection_in_whirlpool_microwave4skyi.pdfIn PDF document text
    • https://gibolavisijubaz.weebly.com/uploads/1/3/0/8/130813033/vekowuzuwaxip_vavudava_luveg.pdfIn PDF document text
    • https://zuzesewijolane.weebly.com/uploads/1/3/1/4/131406438/4088762.pdfIn PDF document text
    • http://www.opentle.orgIn 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
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9aea695-d784-441a-a1c3-1d76c4b48a15/zulogovevibibozizew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa2d9c9d-cc47-4f25-a06d-5d080bc26e7f/99996057287.pdfIn PDF document text
    • https://53ee2ee6-42da-4c96-954f-60f726bc8d53.filesusr.com/ugd/de2744_c4726a58213a4e65b16f9fa60cbd7766.pdf?index=trueIn PDF document text
    • http://wipibefab.onlinewebshop.net/hexaware_technologies_placement_papers_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/beatles_abbey_road_full_album.pdfIn PDF document text
    • https://8c805f22-5240-4a8e-9b4d-8499607ff1fc.filesusr.com/ugd/76156b_6e582845336f4683974c1d4756b0fc0e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jivuxo/download_sims_3_store_items_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d4ff17a-7da0-46aa-8029-cf9f6097f46d/zolomadowofexajes.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/rolaxumuw.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013322.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13322 10420 bytes
SHA-256: 6e96ff6bd5c6a3cae86070718412e4ac5c4a576e7e82ae715778f8eff22049e9
stream_006_off0001913d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1913D 25328 bytes
SHA-256: 0e4ae142d2bb23c95529a1e26a618a8318f7caf05aa374a879e70bef0704bbf5
font_00_sfnt_off0000f352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF352 14632 bytes
SHA-256: 2537329bcfab3ac81a029f9a441794203afe5318eb9bf506a03173ef53e2a7f2
font_01_sfnt_off0001237c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237C 4668 bytes
SHA-256: 15223ea050776ebd910fae11b82811bae4d3d4e805da75abe2a83d982d42c125
font_03_sfnt_off00015057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15057 22828 bytes
SHA-256: 73ea42a1d1c648564e26b153cc8fa34ba51327b5eb251e4bc544644f389d41c1
font_05_sfnt_off0001bd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD7B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
font_06_sfnt_off0001cb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB7C 5716 bytes
SHA-256: db92a473f17b010cfe015ef7f91ee0dd9b4f2551c968e69285184e20fb97f583

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