Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8be4707c6b764b2…

MALICIOUS

PDF

75.3 KB Created: 2021-05-07 23:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a7f64d0c036c4b02fda5b21f6c4e9492 SHA-1: b4b45273dd61b5ca8d2968196f936ba367890c99 SHA-256: d8be4707c6b764b2eacee35a116c20b5a5935df0b4d1238d322013b1735105d5
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many of which are SEO-focused and lead to redirectors, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' strongly suggest this is a lure for unwanted software or phishing. The presence of ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://xezojetit.ru/strik?utm_term=farming+simulator+15+money+cheat+download PDF link annotation
    • http://kizunawinim.getenjoyment.net/learn_english_grammar_rules.pdfIn PDF document text
    • http://lisuzigerob.mygamesonline.org/98692588513.pdfIn PDF document text
    • http://yourcy.com/fresnel_biprism_experiment_viva_questionstufm1.pdfIn PDF document text
    • http://sks-expertiza.ru/kisawajerokhyk.pdfIn PDF document text
    • http://copyrightmediahelp.com/the_killing_of_uncle_sam_wikipedia26t0i.pdfIn PDF document text
    • http://bostpolamos.site/reality_transurfing_method9laut.pdfIn PDF document text
    • http://lagidonak.mygamesonline.org/assyrian_dictionary.pdfIn PDF document text
    • http://paktum.pro/best_alkaline_food_chartk6tds.pdfIn PDF document text
    • http://murimubijejaba.mygamesonline.org/separate_pages_into_one.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/jimugivos/nidud.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/dragon_quest_xi_official_guide.pdfIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_8af241f7ba47470e896da9950991968a.pdf?index=trueIn PDF document text
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_d1849849e2984b288ae873db0c7f37d9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mijumomub/69206330381.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed058e44-8d69-410f-86bf-eb033b882b28/2191831513.pdfIn PDF document text
    • http://naxepedawizozet.onlinewebshop.net/abstract_reasoning_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/231f8539-46f8-4596-87e3-b9c8aabf682a/rca_rtd317w_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/41143740268.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/filmywap_kabir_singh_full_movie_free.pdfIn PDF document text
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_7304dfa624b943d58eaac37d0aaa859d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fikuvine/cerebral_vascular_malformation_hemorrhage.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_off0000e43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43A 5676 bytes
SHA-256: 5a7f7a72a63dceff806bee9621680611d1ab3c894c88eaf71e9366b9734b53d8
font_01_sfnt_off0000f77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77A 12432 bytes
SHA-256: 6d956f365a142c5ee2dac228c79c1fc1f5c788211db499cfe313c255bb02ff7f

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