Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e1064311bb90a0…

MALICIOUS

PDF

79.0 KB Created: 2021-04-02 04:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6f3908572e5c7928b6cd582fbb9c3e9 SHA-1: 7785031d902f63a1e1a16b49cdefd8f844c45343 SHA-256: 99e1064311bb90a00a6e198135416f42611a747d9118c884c958e3b3c082a50b
186 Risk Score

Malware Insights

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

This PDF file is classified as malicious by ML and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, one of which is `https://nipisod.ru/aws?utm_term=how+do+i+refill+my+pitney+bowes+postage+meter`. The PDF's structure and embedded links suggest it is designed to drive traffic to potentially malicious or phishing sites, masquerading as a helpful document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?utm_term=how+do+i+refill+my+pitney+bowes+postage+meter
    • https://wejobufobugof.weebly.com/uploads/1/3/5/3/135348322/b7a879469513.pdf
    • http://matroskin.space/rasuwadi1g3n2.pdf
    • https://punulizi.weebly.com/uploads/1/3/5/9/135957491/81aaa9ba78cb.pdf
    • https://static.s123-cdn-static.com/uploads/4417312/normal_6001e4dd85185.pdf
    • https://cdn-cms.f-static.net/uploads/4408987/normal_6026c6576a01f.pdf
    • https://mewopufi.weebly.com/uploads/1/3/4/2/134265659/796848.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • http://olymp-trade.top/50_top_questions_and_answers_interviewlddjb.pdf
    • http://salonlabs.xyz/lakukivisunagsst4i.pdf
    • https://cdn-cms.f-static.net/uploads/4373509/normal_60503ce748ef7.pdf
    • https://pemolopudamas.weebly.com/uploads/1/3/4/7/134753943/d15734587.pdf
    • https://tikekukitalil.weebly.com/uploads/1/3/2/7/132712015/jufifu.pdf
    • https://lepitosamodovax.weebly.com/uploads/1/3/4/3/134335454/e0d652.pdf
    • https://xifamileg.weebly.com/uploads/1/3/4/6/134687686/sutobe_kirofonozogi.pdf
    • https://xizirujikalowev.weebly.com/uploads/1/3/1/4/131454807/kogabomo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d3dc78e4-0c83-4aad-9564-f3c3367e8d43/kodejajajizufen.pdf
    • https://s3.amazonaws.com/jivagajamav/dibetivakevupunu.pdf
    • https://uploads.strikinglycdn.com/files/1f4f9553-b0ea-4cf8-a216-3b71bb54ea31/fumakebajamesuxexofekan.pdf
    • https://s3.amazonaws.com/xeruxaxer/pebuwigugipufunov.pdf
    • https://uploads.strikinglycdn.com/files/a6f6b1dc-1d2f-4e89-83cb-42bde75d59cb/48782749918.pdf
    • https://uploads.strikinglycdn.com/files/59fc6e54-f9fd-45bf-8ae0-8860ee4012ab/how_to_reset_a_whirlpool_front_loader_washing_machine.pdf
    • https://s3.amazonaws.com/jidosatikim/mitudefusopudowizud.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfbc.bin
8234a587f3e51c00b61fe7713849619b0652d08c2a3388f54d323de7997e1afe
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBC 5656 bytes
font_01_sfnt_off0000f2f2.bin
53765ca85c8bacd6d3e99bf4647fbc6f79cfa572025ff7cd2075a5be38464594
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F2 11152 bytes
font_02_sfnt_off0001192e.bin
9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1192E 16092 bytes