Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d5170e46845bb18…

MALICIOUS

PDF

142.4 KB Created: 2021-02-27 16:26:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fb935e673159bd8c89b9270626b56c59 SHA-1: 498c20c0f957da4cc5b14c85fabbe6f2db7ec8cd SHA-256: 1d5170e46845bb1821a0ef9414a463c2eb0b2c1799264da7c85d2e3886d36a31
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on disposable platforms like Weebly, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic suggest the PDF is designed to lead users to malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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://seumenha.ru/award?keyword=sexual+orientation+bisexual+meaning+in+hindi PDF link annotation
    • https://siwusoxol.weebly.com/uploads/1/3/4/5/134584737/xaworovo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389080/normal_600f034788f19.pdfIn PDF document text
    • http://shoop-fn.ru/19806370252orx3t.pdfIn PDF document text
    • https://zupavuzinopaz.weebly.com/uploads/1/3/4/2/134265708/3881948.pdfIn PDF document text
    • http://mainsale.info/dragon_age_origins_walkthrough_guideqotg4.pdfIn PDF document text
    • http://dodemul.mygamesonline.org/jidagimodusivuxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453142/normal_6036bb33a08fd.pdfIn PDF document text
    • https://vusuranozaxo.weebly.com/uploads/1/3/4/0/134012668/a20c1125.pdfIn PDF document text
    • http://delinapod.mypressonline.com/diwonalalek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368242/normal_6028e74db5397.pdfIn PDF document text
    • http://kprovk.xyz/78296890479njfot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371240/normal_5ffd7d6546f47.pdfIn PDF document text
    • https://ragusixiseditof.weebly.com/uploads/1/3/0/8/130814169/fosisomular.pdfIn PDF document text
    • https://powufekati.weebly.com/uploads/1/3/4/0/134012492/kisumuzebaxike.pdfIn PDF document text
    • http://7lessons.fun/weniferabozusejujofixuxerxv2hc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://juludiripo.myartsonline.com/tubekegalurefawuzer.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/99732918957.pdfIn PDF document text
    • http://xijewixevav.onlinewebshop.net/72514395364.pdfIn PDF document text
    • http://mukanebesiva.atwebpages.com/83752527892.pdfIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/69322483669.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_off0001d8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D8B4 5552 bytes
SHA-256: 507a3bb0e112dcdc42e02a5adfb810688dae9f9ef5f6e097abd9a8d300209b2f
font_01_sfnt_off0001eb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB60 15424 bytes
SHA-256: fbc84732581633a5ef83e815ec0c6964c4a3ac70581576aee260d2570c2b9532
font_02_sfnt_off00021b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21B63 4088 bytes
SHA-256: d0e47f66eebc4d686225f0f1c739415849c3fb085621da998051208aea344008

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