Malicious PDF — malware analysis report

Static analysis result for SHA-256 683bc706f7c8b9da…

MALICIOUS

PDF

79.8 KB Created: 2021-06-06 21:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8f907ed2e60e22e3fb3fb257fb7a8f1 SHA-1: 30c7722dfc30f42d57760ac5dbb432f3f90a7bc9 SHA-256: 683bc706f7c8b9dad6067c54eea5057a369888c3afb349af054773b9a023256e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common technique for SEO link farms and phishing. One prominent URL, 'https://maypoin.ru/wb?keyword=oral%20b%20electric%20toothbrush%20which%20best%20buy', suggests a phishing or scam attempt disguised as a product search. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/wb?keyword=oral%20b%20electric%20toothbrush%20which%20best%20buy
    • https://fapudunaga.weebly.com/uploads/1/3/0/7/130776769/1276017.pdf
    • https://cdn-cms.f-static.net/uploads/4461525/normal_6068c913da2d8.pdf
    • https://static.s123-cdn-static.com/uploads/4491157/normal_5feee3b72b9de.pdf
    • https://cdn-cms.f-static.net/uploads/4454056/normal_5fd7dc19897f5.pdf
    • https://rakazukubuzabi.weebly.com/uploads/1/3/4/7/134736781/a08e70cc151e4a.pdf
    • https://dutumujupag.weebly.com/uploads/1/3/1/3/131383630/2ada768df.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1704d7ba-4061-4164-b72a-b9f64008048d/1620897275.pdf
    • https://uploads.strikinglycdn.com/files/84aa5909-6e86-45b1-bee0-72e4cedf42d1/29694736905.pdf
    • https://uploads.strikinglycdn.com/files/a8ced874-4a84-41dc-a214-87e1ca76d04b/charlie_and_the_chocolate_factory_songs_1971.pdf
    • https://uploads.strikinglycdn.com/files/362d4150-5525-4e8a-bd48-b963a3242988/simple_weekly_timesheet_template_excel.pdf
    • https://uploads.strikinglycdn.com/files/11909315-a34b-4e42-939d-834f911eaa34/how_not_to_answer_deposition_questions.pdf
    • https://uploads.strikinglycdn.com/files/211d2148-24c4-4473-81e7-23fb099474b7/binding_of_isaac_blue_bomber.pdf
    • https://uploads.strikinglycdn.com/files/dc154631-1eed-4d03-afdc-5ba16886ccfe/zenith_transoceanic_royal_7000_manual.pdf
    • https://uploads.strikinglycdn.com/files/f368437a-e049-47a4-911f-4c0a40f3cd3d/vakukexovideda.pdf
    • https://uploads.strikinglycdn.com/files/c362768f-88b5-4597-aff1-10a8ce1ae633/8262887701.pdf
    • https://uploads.strikinglycdn.com/files/1343bb85-4740-44f1-8ac7-d037bdcabcd3/pretest_family_medicine_5th_edition.pdf
    • https://uploads.strikinglycdn.com/files/9d606a75-4891-49eb-9c21-5b688601e970/7672620436.pdf
    • https://uploads.strikinglycdn.com/files/1902824e-83ab-4cf5-82e3-f58249b8d1d5/wivimotolu.pdf
    • https://uploads.strikinglycdn.com/files/3d31e726-c51f-4a93-b979-8a4bcd111d75/gibexufifi.pdf
    • https://uploads.strikinglycdn.com/files/de87b60d-f86c-42ca-8f06-796ccb1085bb/21154751048.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_off0000f629.bin
bd64570e9303cf9fc8319abbdf3cd25f53e45273de3253a87f334534c467f7e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF629 5248 bytes
font_01_sfnt_off00010808.bin
0a8b0b95d7fbe915bf41f9136f37c0827b9135802c405e126946468a4f426b4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10808 11804 bytes