Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e7e543b2241167…

MALICIOUS

PDF

74.3 KB Created: 2021-06-01 05:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d17f2de0ebb59b350bc141073a119f5 SHA-1: 5b4fb1715704796ee4a05bf3ebc40a97bdac062a SHA-256: 65e7e543b2241167c846d415adf834779af729b886e287487fc035a6c8e77da4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The primary URL, 'https://infrive.ru/pbw?utm_term=how+to+get+free+apex+coins+legit', indicates a lure related to obtaining free in-game currency, a common tactic for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://infrive.ru/pbw?utm_term=how+to+get+free+apex+coins+legit
    • https://cdn-cms.f-static.net/uploads/4412181/normal_6066a6ec50303.pdf
    • https://vopakumadojaga.weebly.com/uploads/1/3/4/3/134361244/e46c41a0.pdf
    • https://static.s123-cdn-static.com/uploads/4454054/normal_6002e6557c07a.pdf
    • https://static.s123-cdn-static.com/uploads/4410989/normal_5fc6fea2762e8.pdf
    • https://gasibexagitusin.weebly.com/uploads/1/3/1/4/131408117/bulixeb_levizu_gaboxodo_lelotuwag.pdf
    • https://puwukozo.weebly.com/uploads/1/3/4/5/134587621/mirarosufowogojeru.pdf
    • https://cdn-cms.f-static.net/uploads/4379222/normal_60589eb4b42c6.pdf
    • https://static.s123-cdn-static-d.com/uploads/4475197/normal_60b2764b89f07.pdf
    • https://static.s123-cdn-static.com/uploads/4378381/normal_5ff59e3de0d49.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://letonepamusi.pbworks.com/f/imagine_that_you_and_roger_in_thank_you_maam_meet.pdf
    • https://uploads.strikinglycdn.com/files/93085b3d-57d9-4331-a449-6c64576f3772/52519544087.pdf
    • https://uploads.strikinglycdn.com/files/59a52332-9b92-45e4-861c-170fc03164ff/is_romeo_and_juliet_love_at_first_sight.pdf
    • https://uploads.strikinglycdn.com/files/09d0a28a-b255-4bc6-af1c-a70d1f9f14c7/78376647937.pdf
    • https://uploads.strikinglycdn.com/files/4ec4148d-ddb2-414f-9737-ec3bf1e756e8/99546147656.pdf
    • http://xovelezid.pbworks.com/w/file/fetch/144415719/descargar_gta_sa_para_android_lite.pdf
    • https://uploads.strikinglycdn.com/files/8bdf7cbe-0813-4a1e-8996-69a83931b279/lixosusitegofuf.pdf
    • https://uploads.strikinglycdn.com/files/bd352193-8d3d-487d-ad01-60a0de699428/10_day_green_smoothie_cleanse_first_5_days_shopping_list.pdf
    • https://uploads.strikinglycdn.com/files/e9794074-f673-4672-8189-9310bc5f16d0/ponefugarogoluwefexatomej.pdf
    • http://kapetipubi.pbworks.com/f/26071074048.pdf
    • https://uploads.strikinglycdn.com/files/9725e93c-3aa4-4c1c-8aaa-cc72cdea4d2b/fisher_price_rainforest_jumperoo_replacement_toys.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_off0000e287.bin
6c8094f1c59cc6f632de71d66f4c455d74d148f6e6d7f3e0b1d06f7b50b4d57b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE287 5304 bytes
font_01_sfnt_off0000f4c1.bin
0442a2c98196e82a8a2d3452a93e728118719c7ec7f253376976b0791b6859e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C1 11592 bytes

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