Malicious PDF — malware analysis report

Static analysis result for SHA-256 c853175bb1bdb20c…

MALICIOUS

PDF

81.7 KB Created: 2021-03-20 01:32:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea3c35e0de88728f87bec9898bdb0203 SHA-1: 73f41f4c3e344f14db2cd697f9a2fbf9d2777dd9 SHA-256: c853175bb1bdb20cd89ed945b9a88ea358e527761c39d80f966498e675f3b9ec
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated or use link farms, indicating a likely SEO spam or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nipisod.ru/123?utm_term=discontinuity+in+rational+functions+worksheet
    • https://kigokevorusom.weebly.com/uploads/1/3/4/7/134709893/15ce21875f.pdf
    • https://cdn-cms.f-static.net/uploads/4387037/normal_6022cd5c92011.pdf
    • https://cdn.sqhk.co/kixagixupo/gdNEhdP/sapowusukizepewu.pdf
    • https://cdn.sqhk.co/lufelumad/ha8txuO/the_last_outpost_2020.pdf
    • http://wodedutipif.medianewsonline.com/que_tipo_de_fruta_tiene_katakuri.pdf
    • https://mixenabunagoxo.weebly.com/uploads/1/3/5/3/135320093/8266343.pdf
    • https://cdn.sqhk.co/letarezetap/gchdjaG/lolegafofapolad.pdf
    • https://cdn.sqhk.co/bezorufuv/jjjagfu/alien_blackout_for_pc.pdf
    • https://voxalasodakuro.weebly.com/uploads/1/3/4/0/134042561/fatokavoluvo.pdf
    • https://cdn.sqhk.co/jubawiwa/a38jjTY/1980s_and_1990s_r_b_music.pdf
    • https://cdn.sqhk.co/kejofuvata/bighWie/51853536889.pdf
    • https://static.s123-cdn-static.com/uploads/4459027/normal_5fc6db0369770.pdf
    • http://minosijasif.mypressonline.com/anatomie_de_l_appareil_genital_de_la_femme.pdf
    • http://kowojolajamuv.getenjoyment.net/rti_application_format_in_english.pdf
    • https://cdn.sqhk.co/fujotojaxob/fhhpjdg/68515976838.pdf
    • https://niniteju.weebly.com/uploads/1/3/0/8/130814631/873366.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/b0a6972d-39f5-4a15-b21e-5af22ba66499/alaska_driving_licence_requirements_in_india.pdf
    • http://juludiripo.myartsonline.com/what_size_ammo_does_an_ar_15_take.pdf
    • https://uploads.strikinglycdn.com/files/0a14dbac-4151-404a-b4df-263742337826/vekapisuvibapap.pdf
    • https://uploads.strikinglycdn.com/files/bb439bb4-b781-4d28-aa63-1a568850f1e5/91737987559.pdf
    • https://uploads.strikinglycdn.com/files/c094f00a-35c3-47cc-b4e0-bf01e4ef8c2e/goxilunitolemutufuvepoj.pdf
    • http://lopakesuzuw.atwebpages.com/21425952972.pdf
    • https://uploads.strikinglycdn.com/files/e1ad40e3-1eb6-4c3c-99a0-985d0bdef4a0/49769369878.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e737.bin
a20bb4f408d8f784ad73c3448e4c5f25c27999cb50838481ad122ee355a0e39f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE737 3040 bytes
font_01_sfnt_off0000f222.bin
f1d834795b58ad8d971bbe212bc59d1c2d4b40bc7a221cc0ed0ee511e35f71e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF222 5108 bytes
font_02_sfnt_off0001038b.bin
6e33657b941efdb66eb0f0bf6c772be8a0928974683617cc79a85399c0a3d484		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1038B 11440 bytes
font_03_sfnt_off00012aae.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAE 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.