Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93e85a29842a92f…

MALICIOUS

PDF

106.3 KB Created: 2021-03-16 01:07:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 860c3042ec3be7e0189fa4be5b543425 SHA-1: 564023e35166ff808c8c9321ef8a3b0c2875c51b SHA-256: d93e85a29842a92f368d26814114f98d6805e1ee5fd6b5ac4c30efec7078952a
156 Risk Score

Malware Insights

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

The PDF file, disguised as a resource for learning English, contains a large number of external links, indicating a potential link farm or distribution mechanism for other malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a malicious campaign.

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-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://zajinet.ru/award?keyword=how+to+become+a+good+english+speaker+pdf
    • https://cdn-cms.f-static.net/uploads/4379837/normal_6041910d19deb.pdf
    • https://cdn-cms.f-static.net/uploads/4447497/normal_602422fe6c071.pdf
    • https://rebeluzibefu.weebly.com/uploads/1/3/4/6/134619862/gozewajefuze-wafivuvunimus-jinine-zadusopiju.pdf
    • https://lolijigi.weebly.com/uploads/1/3/4/7/134700793/9a187d.pdf
    • https://cdn.sqhk.co/rorazelesu/gfkieVj/good_company_game.pdf
    • https://cdn.sqhk.co/baxikomo/ijQhfQu/72889595224.pdf
    • http://shopsmmv.site/ambasada_kanadeze_ne_prishtine9g2m2.pdf
    • http://lovelyhouse.online/dork_diaries_10_full_bookmk5u6.pdf
    • https://static.s123-cdn-static.com/uploads/4472766/normal_5fe4a09153217.pdf
    • https://tezagezowuvese.weebly.com/uploads/1/3/0/7/130775310/8007812.pdf
    • https://sojuvamufivuleb.weebly.com/uploads/1/3/0/8/130874470/8a61e2bb51c.pdf
    • https://cdn.sqhk.co/febenanedibu/Jtjheja/domitujewukenive.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/zedudo/spider_man_game_for_android_ppsspp.pdf
    • https://s3.amazonaws.com/lizuseguwix/32681609649.pdf
    • https://s3.amazonaws.com/bojafazes/40675254783.pdf
    • https://s3.amazonaws.com/zemunomipazikez/acneiform_rash_causes.pdf
    • https://s3.amazonaws.com/fikuvine/how_to_notify_employer_of_death_in_family.pdf
    • https://s3.amazonaws.com/tuletivotarupu/botedag.pdf
    • https://s3.amazonaws.com/ragejufa/how_to_open_the_back_of_a_tissot_1853_watch.pdf
    • https://s3.amazonaws.com/saziwijaxodav/11843135496.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_off00015448.bin
d76f0f4b7c95d8ce8ba64e0d7f3dc98142bc74e77d320ba9b7d967448266b064		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15448 5616 bytes
font_01_sfnt_off00016734.bin
c5e6990435890c29e2ed3e265b6d9bd9f1f0350270e5bb96ec9efdae529327d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16734 11316 bytes
font_02_sfnt_off00018d9e.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18D9E 4324 bytes

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