Malicious PDF — malware analysis report

Static analysis result for SHA-256 3692aa5a25bc9148…

MALICIOUS

PDF

81.7 KB Created: 2021-03-28 22:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0e72cfec62087e1b90d6b4237529014c SHA-1: 14422f71ccdcb335020c69d51476932ee1ad590f SHA-256: 3692aa5a25bc9148d5e19795e531cc54e41185eab93dc258ff87b28d8543f5ad
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or SEO spam. One prominent URL, https://jacksth.ru/award?keyword=antimicrobial+activity+of+aloe+vera+pdf, suggests a lure related to scientific research to entice clicks. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://jacksth.ru/award?keyword=antimicrobial+activity+of+aloe+vera+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413240/normal_604d1e72289c1.pdfIn PDF document text
    • http://artrosil.xyz/which_photoshop_is_best_for_beginners2c2ta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483345/normal_604e0ce44a3b6.pdfIn PDF document text
    • http://ilkertr.shop/how_to_reset_ink_level_epson_l110zlccy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426687/normal_602f1137ce1da.pdfIn PDF document text
    • http://service-hire.com/bawuginadumatirugiguvutuvti5lb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387235/normal_5fe4dd9e1a595.pdfIn PDF document text
    • http://desekikimok.22web.org/weider_ultimate_body_works_bench_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_7a8ead9b8b0149f295f80276928426e4.pdf?index=trueIn PDF document text
    • https://3dbd840c-7861-42b4-b064-af52d1d2f4eb.filesusr.com/ugd/86319b_161fa662e66746839f3de889695675a7.pdf?index=trueIn PDF document text
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_c3b1d0997d0a4161b2675be234a1bbf5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vapite/java_callback_android_example.pdfIn PDF document text
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_49420529ca3446f59d28ac72878d1f41.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/99993706981.pdfIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_fc2d419b75bd4a4c9b8f523b80fd5b1c.pdf?index=trueIn PDF document text
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_3ff373114bdf4c899763093300206feb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/70284381286.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/what_is_the_main_objective_of_social_work.pdfIn PDF document text
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_ce14601c05694174b6e9fd39f63aca8c.pdf?index=trueIn PDF document text
    • http://rofixalo.epizy.com/old_yeller_novel_study.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/91015573716.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF384 5200 bytes
SHA-256: cb58efa5b4d5268f7e16661a85d23a99bde7277eb2870d4c1d737ce72ddfde90
font_01_sfnt_off00010516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 10652 bytes
SHA-256: aeb546f3410b8e4c6b09afe7d4894d0677e85b3d83c4e5230e658c5fdc155b7e
font_02_sfnt_off00012979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12979 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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