Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3da7862aeee844…

MALICIOUS

PDF

85.2 KB Created: 2021-05-31 19:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d31294c28d883e100979504f11eb45c5 SHA-1: ed567d0b1fb18ab169601fb0e9785268260ed8d0 SHA-256: 8d3da7862aeee8442665a0603f43871e85ef5f2eaadd5dab84a0835965934e1a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external links, suggesting it is part of a link farm or phishing campaign designed to redirect users to potentially harmful websites. The presence of embedded URLs and the overall structure point towards a phishing attack, likely using a lure related to network device configuration.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://cructi.ru/pbw?utm_term=how+to+reset+tp-link+extender+ac1750
    • https://cdn-cms.f-static.net/uploads/4392862/normal_5fd37cb1567c4.pdf
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/zokebe.pdf
    • https://static.s123-cdn-static.com/uploads/4383451/normal_5fc937006f69c.pdf
    • https://cdn-cms.f-static.net/uploads/4445558/normal_605fd432476d2.pdf
    • https://static.s123-cdn-static.com/uploads/4443617/normal_5fe129d610000.pdf
    • https://pijegedup.weebly.com/uploads/1/3/4/8/134870890/966082.pdf
    • https://lonerunit.weebly.com/uploads/1/3/4/0/134017922/xerasubibatipekodu.pdf
    • https://sokazavuse.weebly.com/uploads/1/3/1/3/131378988/fufulu_radodap.pdf
    • https://static.s123-cdn-static.com/uploads/4390330/normal_60009eba215e6.pdf
    • https://ravijirigiraga.weebly.com/uploads/1/3/4/6/134649302/2950080.pdf
    • https://jumufewaxijakuk.weebly.com/uploads/1/3/1/3/131380308/vubirenol.pdf
    • https://cdn-cms.f-static.net/uploads/4365649/normal_606e12673378f.pdf
    • https://cdn-cms.f-static.net/uploads/4422894/normal_602768566802b.pdf
    • https://lemapemoj.weebly.com/uploads/1/3/4/0/134040436/4728224.pdf
    • https://riwumoba.weebly.com/uploads/1/3/5/9/135965326/2830045.pdf
    • https://static.s123-cdn-static.com/uploads/4365662/normal_5fcf28e4ef24d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/67ded358-c623-476d-a61b-7d20943cc94a/37505555875.pdf
    • http://mumubib.pbworks.com/f/niligixezomozanusixisan.pdf
    • https://uploads.strikinglycdn.com/files/b5c04eea-457a-406c-ac0c-4f34d2d274e4/wahl_lithium_ion_duo_premium_hair_clipper_and_trimmer_kit_reviews.pdf
    • http://xoxafepapesu.pbworks.com/f/20571642886.pdf
    • http://nagomax.pbworks.com/w/file/fetch/144412536/vamupaxodoxedigexor.pdf
    • http://nusuwoxub.pbworks.com/f/bana_seni_seviyorum_deme_hissettir_kitab.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_off0000dbef.bin
0fb0b34b395dbdfba3aa9bcbc24bb6040ca98f0bb2f3dd205aeb431352d1cd2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEF 3796 bytes
font_01_sfnt_off0000e977.bin
7f1ed8327d9a5f6e9aa697c0ef76c7c9a889289a6402219c04c40072d689dac4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE977 5680 bytes
font_02_sfnt_off0000fcfb.bin
0b78354d6671b8a1441e70b563bd92160f6067e7bfe70baa23e15c8ab3cadc2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFB 18376 bytes
font_03_sfnt_off00012d71.bin
6102181e9216da37dae869c6254adf6e6727e745d5557b43eb724c6cef09eefd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D71 16720 bytes

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