Malicious PDF — malware analysis report

Static analysis result for SHA-256 684784b0c8318ea8…

MALICIOUS

PDF

69.7 KB Created: 2021-03-03 03:20:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 296643f791a1fe27f1624beaafbcc603 SHA-1: e7e73297e7be4aedbb0d70f542ad704bb57b0561 SHA-256: 684784b0c8318ea837e50eddffbc2e4e74a38397e9860d609a182e7194dd19e0
186 Risk Score

Malware Insights

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

The file is a PDF containing a large number of external links, many hosted on disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO manipulation. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a mechanism for redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://jacksth.ru/award?keyword=la+la+land+theme+cello+sheet+music PDF link annotation
    • https://bewimesev.weebly.com/uploads/1/3/4/7/134753962/45e86d.pdfIn PDF document text
    • https://kimiligemapi.weebly.com/uploads/1/3/4/3/134343210/4471524.pdfIn PDF document text
    • http://mipasotul.22web.org/96915571568.pdfIn PDF document text
    • https://suwesinorilofev.weebly.com/uploads/1/3/4/0/134096988/4943733.pdfIn PDF document text
    • https://safasisi.weebly.com/uploads/1/3/4/4/134472516/mibaxipuveredurelip.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/gjVhjIS/zeraxosedamuvuzijapudolat.pdfIn PDF document text
    • https://digavonuvuveg.weebly.com/uploads/1/3/4/8/134851043/cc9f1e3f3dea9.pdfIn PDF document text
    • https://lirefabagobaxi.weebly.com/uploads/1/3/4/0/134012393/sofurire.pdfIn PDF document text
    • https://tedisizizifem.weebly.com/uploads/1/3/4/2/134235801/vexebixidurofak.pdfIn PDF document text
    • https://cdn.sqhk.co/motanunika/OoYjc5e/juvapotuzowunuvusere.pdfIn PDF document text
    • https://daputonekamipit.weebly.com/uploads/1/3/0/7/130775603/nosefezevago_rubaxoz.pdfIn PDF document text
    • http://femalawiterig.iblogger.org/report_on_teachers_day_celebration_in_marathi.pdfIn PDF document text
    • https://pesasujax.weebly.com/uploads/1/3/4/8/134882000/nomovopineg_dofim_napavipefum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gefetela.epizy.com/fluvial_erosional_landforms_in_deserts.pdfIn PDF document text
    • http://pupisovid.epizy.com/4805693294.pdfIn PDF document text
    • http://jarunitilor.rf.gd/plantronics-cs540_convertible_wireless_headset_instructions.pdfIn PDF document text
    • http://vebadivikini.rf.gd/noripo.pdfIn PDF document text
    • http://fejozimi.epizy.com/magic_the_gathering_card_value_guide.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC717 4908 bytes
SHA-256: ab8b95621277fc219aa44cd3b2117555242d73ecfb9b837ae7298115564297ef
font_01_sfnt_off0000d792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD792 10388 bytes
SHA-256: 06d7c15421dd72c1c6f17fbde57b8ddc399475bfadb3781e0b512f3e4fb035ca
font_02_sfnt_off0000fb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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