Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a32eb41e4489006…

MALICIOUS

PDF

81.3 KB Created: 2021-03-17 10:55:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42a24b9730092b53f71a4cd8506b20d7 SHA-1: 186069d931c50b449e8f42e2fc7cd4aa5597821d SHA-256: 8a32eb41e448900692f4008f4914d6d08b24edb1cdbca0072332acb899a884d2
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent link pointing to a suspicious URL. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crophysi.ru/strik?utm_term=hp+deskjet+2546+scan
    • https://cdn-cms.f-static.net/uploads/4495409/normal_604fa65aaac8d.pdf
    • https://logifuvixejexa.weebly.com/uploads/1/3/6/0/136019385/f0218c676.pdf
    • http://pemufosapakem.mypressonline.com/81972350666.pdf
    • https://nelubetif.weebly.com/uploads/1/3/5/3/135322580/novapeloxemib.pdf
    • http://xenejesujotolud.mypressonline.com/munugekibekeb.pdf
    • https://cdn-cms.f-static.net/uploads/4387056/normal_60303e6cab093.pdf
    • https://tunibedexorole.weebly.com/uploads/1/3/5/3/135350281/xipofekatukoge.pdf
    • https://cdn-cms.f-static.net/uploads/4412593/normal_6010ef651440b.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/85baeba4-2e0b-4ab8-86f3-55cc4530c9b9/39882391153.pdf
    • https://uploads.strikinglycdn.com/files/b0be4c43-67fe-4e03-b829-5c68d2b1e0c3/bryant_programmable_thermostat_battery_replacement.pdf
    • https://s3.amazonaws.com/dugibabafod/contemplate_on_something_definition.pdf
    • https://uploads.strikinglycdn.com/files/dc6be699-895b-4e5e-ab96-1ffa2f13718f/71037166473.pdf
    • https://s3.amazonaws.com/gixawetopoli/liwuvabu.pdf
    • https://uploads.strikinglycdn.com/files/d93eae90-604a-4ae8-976c-ceead91e8958/sony_dav-tz145_price_in_india.pdf
    • https://uploads.strikinglycdn.com/files/4644e7b7-da80-4b38-8fdd-a18522445288/42044629819.pdf
    • https://uploads.strikinglycdn.com/files/3491e43c-fd76-41d5-8b29-fd5741be9532/samsung_un46eh5300_backlight.pdf
    • https://uploads.strikinglycdn.com/files/42d8e418-bd76-4f9d-a565-64e85b30fd69/how_to_unmute_sennheiser_ew_100_g3_receiver.pdf
    • http://farovosodiwes.atwebpages.com/leneriv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5fc.bin
8b69ad8bf8706a8de8604f0485c67fb25a23b24d50174afbb8bbf061f3c53837		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FC 1684 bytes
font_01_sfnt_off0000fe60.bin
c5681f295403d1560606d5d7b20af28d713c89364b85c7e144be05bc44351c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE60 5536 bytes
font_02_sfnt_off0001115c.bin
8ac65ced5d4c91d7ec07e18711ebaa8d7a194b1238cce939510ec22d453889af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1115C 10908 bytes

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