Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9260f5d54bbcd44…

MALICIOUS

PDF

87.0 KB Created: 2021-03-15 01:26:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afa0bf07c02880dee18e82344f1a64f4 SHA-1: 57adaf63328f78a56ea902b5391a96cd7c06ff23 SHA-256: d9260f5d54bbcd443ead1a70742ccd7ce3785f20983d5595c2ee67d5d7459a9e
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a PDF link farm. The primary URL, 'https://nipisod.ru/wix?keyword=all+sulfate+minerals+contain+the+elements', suggests a keyword-driven SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via the numerous linked PDFs.

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://nipisod.ru/wix?keyword=all+sulfate+minerals+contain+the+elements
    • https://wenezobu.weebly.com/uploads/1/3/4/6/134625155/natodisojuxuwanigef.pdf
    • https://cdn.sqhk.co/dawupana/qgigdib/99913661304.pdf
    • https://cdn.sqhk.co/ridijafugemi/gf2tjdB/13283197281.pdf
    • https://cdn.sqhk.co/berazanoga/dhcR6Ej/no_watermark_video_download_tik_tok.pdf
    • http://heartcenteredequestrian.com/sisters_of_battle_animevchwe.pdf
    • https://cdn.sqhk.co/susiwozobo/ijiijGb/uber_eats_local_food_delivery_app_download.pdf
    • https://cdn.sqhk.co/vafebutiman/uEjghd1/91153853402.pdf
    • https://cdn.sqhk.co/navuwamas/jdGTxhf/pudovituvogivovadekuned.pdf
    • https://zabemogir.weebly.com/uploads/1/3/4/0/134016966/1529286.pdf
    • http://biomaniix.website/67467323297dj4d0.pdf
    • http://islemleriniz.org/37379346193qyaef.pdf
    • https://cdn.sqhk.co/gadujotev/bg2hhjT/geometry_dash_meltdown_pc_download.pdf
    • https://nenubijul.weebly.com/uploads/1/3/5/3/135393623/gesokukaleze-zusotire-kifuduruwi.pdf
    • https://cdn.sqhk.co/ninilevikod/gcx0iaG/xijije.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_b720e3a604074cc5bb8487b393aa632d.pdf?index=true
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_762028f379f447f2a586de0f85b90c81.pdf?index=true
    • https://uploads.strikinglycdn.com/files/baf6c84d-8864-4959-8450-545675aa97a8/99_dewalt_drill_at_lowes.pdf
    • https://uploads.strikinglycdn.com/files/e9688e5f-351d-43ea-a8f5-90d389b4d47f/juvudokitipuriguguxa.pdf
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_d6de3f46d7724fbe953e3e3a8b53f803.pdf?index=true
    • 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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101ad.bin
d2077f5d6d5b1d677d9b6d000eb087611a047961d42ceeb980acba3b54af8b85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101AD 6492 bytes
font_01_sfnt_off000111e2.bin
6083f9f1d39e9d13dfe11b6054d704bf55194a6dac01c852555dda1adb352cc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111E2 5112 bytes
font_02_sfnt_off0001231b.bin
da27a136725d6847d6c29475d73b188b27401ad6c62d511a5034c981ff4fe7ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1231B 12564 bytes

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