Malicious PDF — malware analysis report

Static analysis result for SHA-256 57763f789052bdca…

MALICIOUS

PDF

80.7 KB Created: 2021-03-25 15:22:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e872f93ee98b45a834a6743ffedcccb3 SHA-1: 9de4ab0fe24598c9c23c0fd1574456aeadf4686d SHA-256: 57763f789052bdcae79fe76be7d4b1dc2b481778a04cc8285e239a1d9222d0bd
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URIs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/123?utm_term=garden+of+salvation+raid+boss+guide
    • http://pirewixuzejetin.iblogger.org/farinaz.pdf
    • http://mowefopovog.mywebcommunity.org/56374886148.pdf
    • https://jazejuvo.weebly.com/uploads/1/3/4/4/134439384/loropovotinovur.pdf
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/togadibidugi.pdf
    • https://wolunogejafijut.weebly.com/uploads/1/3/4/6/134649672/49364a8ecbde.pdf
    • http://mubarominufu.iblogger.org/23926220041.pdf
    • https://kazajiti.weebly.com/uploads/1/3/4/4/134456981/8954122.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_121f1127f30b48a0bc2565fda2ab856d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4c9442eb-27e6-4a6a-b5b1-9cbdd3fbc65f/94003089730.pdf
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_896dd7981647436f9fd3b1b7c20c311e.pdf?index=true
    • http://tepoguko.epizy.com/scary_stories_3_more_tales_to_chill_your_bones_download.pdf
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_cf55c83651004065b9d93e8f912095a9.pdf?index=true
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_a3c7b239b63b493c97c03857d3e46d57.pdf?index=true
    • http://jizuvopanusin.rf.gd/hayward_1.5_hp_power_flo_matrix_above_ground_pump.pdf
    • https://29bb9f0a-cb36-4278-8b1c-05d86a2267e4.filesusr.com/ugd/25e746_b23dd19421fc48f0bc30b2e3d9ac4066.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d068ccda-d438-4b80-b00b-19ea6b53d743/42305468809.pdf
    • http://taguminuligifis.rf.gd/wudiwe.pdf
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_0537cdc33a9a4796913f2bf95634bed4.pdf?index=true
    • http://sojufuka.atwebpages.com/el_desafo_del_amor_40_das_pelcula_completa.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_off0000fee8.bin
639673a5167c42246b9e0d96258d50d3b48e3019e0fe8511ef326310f618c115		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE8 5304 bytes
font_01_sfnt_off0001110e.bin
10b3a26a4a1e2ce43147a66252661e5590a5a686ba42af455f5386950e9420a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1110E 10552 bytes

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