Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92ad70412c618c6…

MALICIOUS

PDF

69.9 KB Created: 2021-02-20 03:01:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e0c3bf076816576934e8da07bf1f7d22 SHA-1: 230564e078c3cd29484cf41a913171cd330b7648 SHA-256: c92ad70412c618c6d3b8837ece8661e21865d68a61ef6f6196bf3a932c3e1acd
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to other PDFs hosted on various domains, many of which appear disposable. The primary purpose seems to be SEO manipulation or distributing further malicious content through these links.

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://jottigo.ru/123?utm_term=the+boarded+window+theme PDF link annotation
    • https://majotowuwirup.weebly.com/uploads/1/3/5/3/135346036/1398913.pdfIn PDF document text
    • https://zerimesatevig.weebly.com/uploads/1/3/4/8/134879836/misuxubabonaxanu.pdfIn PDF document text
    • https://taxudomajifi.weebly.com/uploads/1/3/4/1/134108655/jadub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369779/normal_602adc56932b4.pdfIn PDF document text
    • https://vepodiruwa.weebly.com/uploads/1/3/4/3/134374194/wusuniretudik-gujamitubuwarik-nojuveb-kivagetidebi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485004/normal_5ff655b6efae9.pdfIn PDF document text
    • https://varozifan.weebly.com/uploads/1/3/0/7/130740200/c64dfd6.pdfIn PDF document text
    • https://jofevuwob.weebly.com/uploads/1/3/4/2/134235005/7844291.pdfIn PDF document text
    • https://zubowosusotikip.weebly.com/uploads/1/3/1/6/131637009/9476276.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481663/normal_60021cf68a1b2.pdfIn PDF document text
    • https://lubefapezixa.weebly.com/uploads/1/3/1/3/131398117/5155815.pdfIn PDF document text
    • https://mopebewugo.weebly.com/uploads/1/3/0/7/130776026/vakadimuxabibew.pdfIn PDF document text
    • https://libizegenumejav.weebly.com/uploads/1/3/0/7/130775388/500196.pdfIn PDF document text
    • https://jimekomu.weebly.com/uploads/1/3/1/4/131453536/bufosudaroz_taveginoxetiv_lepupuraza_vozunumemu.pdfIn PDF document text
    • http://tulakijumipad.22web.org/481644297.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/tugevidujunop.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/kosoxowajasewos.pdfIn PDF document text
    • http://xuperag.epizy.com/1412970971.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67B 5036 bytes
SHA-256: d4438d8898984613a8149510346df9e7426f56a3569f2551ca6d4818d7cf43d7
font_01_sfnt_off0000e77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77D 10348 bytes
SHA-256: d3cf7c2ba5925eff3397a4afe5339fb73d2c73b1de318b64d7f6e3379e430676

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