Malicious PDF — malware analysis report

Static analysis result for SHA-256 674b182c11c51b56…

MALICIOUS

PDF

83.6 KB Created: 2021-05-30 12:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e56241d29680d55490d970822154142 SHA-1: 5bebfc9564df509998f812c3ba5e1283673dfbd3 SHA-256: 674b182c11c51b56b11a17cca21e58be698701942ce34b471d2d2578d4859b83
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for link farming or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' and the presence of multiple unknown reputation URLs strongly suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to exploit users through deceptive content, likely leading to a phishing page or a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/123?utm_term=hindu+tamil+news+paper+app+free
    • https://refedekejevejat.weebly.com/uploads/1/3/4/3/134312363/525481077.pdf
    • https://pokifuduxorimib.weebly.com/uploads/1/3/4/5/134501468/e6e236bb7f05.pdf
    • https://cdn-cms.f-static.net/uploads/4468531/normal_60665d6baefb9.pdf
    • https://tetavezodumop.weebly.com/uploads/1/3/4/6/134645623/e763a97.pdf
    • https://midamexup.weebly.com/uploads/1/3/5/3/135314938/zexisogimenuzad.pdf
    • https://cdn-cms.f-static.net/uploads/4368977/normal_601564839be55.pdf
    • https://cdn-cms.f-static.net/uploads/4464996/normal_6038de158848b.pdf
    • https://static.s123-cdn-static.com/uploads/4470024/normal_6003afb5d4501.pdf
    • https://cdn-cms.f-static.net/uploads/4369922/normal_605fbf9811550.pdf
    • https://static.s123-cdn-static.com/uploads/4382639/normal_5fdd972c7ce22.pdf
    • https://jatitebomotopoz.weebly.com/uploads/1/3/0/7/130776336/xemivuzoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://uploads.strikinglycdn.com/files/59d78749-c9bd-4c81-9737-43aae73eb3bc/should_you_buy_a_wii_u_in_2020.pdf
    • https://uploads.strikinglycdn.com/files/47519748-efea-447f-91db-5c699aa3a631/the_tempest_sorcerer_crossword_clue.pdf
    • https://uploads.strikinglycdn.com/files/cd64e404-28a1-4e40-b345-f97a02876ad4/how_much_are_computer_classes.pdf
    • https://uploads.strikinglycdn.com/files/0c4c6d7b-d405-498c-b589-ac2f017d9389/74820795877.pdf
    • https://uploads.strikinglycdn.com/files/6b3a4723-30cd-407b-8718-3750bd515f34/84965331400.pdf
    • https://uploads.strikinglycdn.com/files/27f81d75-7810-473e-a2c1-8946a2ac7967/nixon_time_teller_p_strap.pdf
    • https://uploads.strikinglycdn.com/files/1568a52e-efc8-4dad-8f16-32d939d6baf1/91984074967.pdf
    • https://uploads.strikinglycdn.com/files/b8891dc6-fe50-4040-a9af-14df93f2a3cf/dojedamavufodewiz.pdf
    • https://uploads.strikinglycdn.com/files/7c3c40a7-269c-4bcd-8c6e-001301d3038b/scary_stories_to_tell_in_the_dark_3_harold.pdf
    • https://uploads.strikinglycdn.com/files/95e5f7f5-5bdb-42ae-820e-7d6054953d9d/bipek.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e57d.bin
1eceafd847843680d4075a50530115f830560e9a5fe15a7507eb2f8093e27c56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE57D 5240 bytes
font_01_sfnt_off0000f748.bin
d6fd156b4e5d74fd308a16a2307c39d52a136c2927fc883bf6ec92aaf4a0ba51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF748 3432 bytes
font_02_sfnt_off00010406.bin
df990f51c5143fabfe163515e15542245c03d1755310f51afbc2fb05ed1815b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10406 10952 bytes
font_03_sfnt_off00012957.bin
d1a4c78ef556d8252eaaeead95fd6e0540edb04596780bf3770e55fda0b1f776		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12957 16196 bytes

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