Malicious PDF — malware analysis report

Static analysis result for SHA-256 f607d9f7f3b20379…

MALICIOUS

PDF

81.3 KB Created: 2021-04-05 10:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 266344257d7f53a20561b9be77ed8482 SHA-1: 5a8bb36338a7551af63d510d11a710d98f6ed91b SHA-256: f607d9f7f3b203793f1d705489119e093aa1ef886c9f0b3929efcc0922289892
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, likely to manipulate search engine results or direct users to malicious sites. The embedded URL 'https://zajinet.ru/strik?utm_term=why+do+couples+have+arguments' and the first link in the farm 'https://xuwejemeluk.weebly.com/uploads/1/3/4/3/134314543/juraditek-tuvamexer-dojajuzik-lirokifop.pdf' are key indicators of this activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=why+do+couples+have+arguments
    • https://xuwejemeluk.weebly.com/uploads/1/3/4/3/134314543/juraditek-tuvamexer-dojajuzik-lirokifop.pdf
    • http://xonitaj.mywebcommunity.org/movado_series_800_gold_and_silver.pdf
    • http://sosuziba.mypressonline.com/charlotte_s_web_chapter_5.pdf
    • https://gupibaparokepes.weebly.com/uploads/1/3/4/8/134889539/pazasewi.pdf
    • https://najilemizosi.weebly.com/uploads/1/3/4/7/134730194/bafesofegere.pdf
    • https://gefozusep.weebly.com/uploads/1/3/5/3/135346228/felogusires-vodomaxotu-xativoza-zatipijenizejis.pdf
    • https://misapunuzure.weebly.com/uploads/1/3/1/6/131606411/ragenum.pdf
    • http://fitusaj.22web.org/28283944768.pdf
    • http://nepatokada.mypressonline.com/90611749149.pdf
    • http://pixidilivutep.medianewsonline.com/biological_buffer_system.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feselipalez.epizy.com/33785108130.pdf
    • http://wazivutoterer.epizy.com/jovaxad.pdf
    • http://tajemom.epizy.com/11557958277.pdf
    • https://59b17237-83b3-47c6-9d40-f547da5b0434.filesusr.com/ugd/827194_319d9dc9d6914681a2dddf7366cc546b.pdf?index=true
    • http://pikarofuwab.epizy.com/acronis_true_image_hd_2014_free.pdf
    • https://de26864d-dd79-4a6d-8467-b5cf435a6969.filesusr.com/ugd/6ff07c_fdeee3d2e9cb4db793d2110278d849ed.pdf?index=true
    • http://xixovunutev.epizy.com/easy_origami_with_rectangular_paper.pdf
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_5cec9cc1e9ca4f418ecd03df2500f8ef.pdf?index=true
    • https://1dda4824-043e-406b-9213-03d4b91bb4d1.filesusr.com/ugd/7695bb_a33a3bfe15d5433d8c06e3927fd43451.pdf?index=true
    • https://a804c8a8-fdf7-4fba-b19b-c23aecc29597.filesusr.com/ugd/a7074a_60ea1b226ab847bdbf8dbad46be265b6.pdf?index=true
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_1fde6a3c2744402485d94033ebef9fcc.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc84.bin
ad08943015b0ff30a401518a2242e808eefeb38c3df37fdedd5565fa4df44bb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC84 5664 bytes
font_01_sfnt_off00010fb8.bin
5224c129010abb401cdf95dacd82949201d3466ede9ef7cf404525505b1f5a29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB8 11256 bytes

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