Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35d9d6c1971940c…

MALICIOUS

PDF

67.7 KB Created: 2020-12-27 06:37:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0b7f0951674cce42b0c905c074a08f07 SHA-1: 600bd14026aae0ea74892e89742e24c9feeb0a57 SHA-256: c35d9d6c1971940c92c94746be5360f3b12060804297cfa4ebb6c932d610df47
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded external links, many pointing to external websites, which is indicative of a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/strik?utm_term=drum+set+music+video In PDF document text
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/147752.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/482f2314-b6ba-466f-98ca-364a98fd310c/hurafeler_ve_gerekler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af371905-74db-4d78-8db8-02109fe4d7ec/uih_cerner_access.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a726868f-e008-4039-9e8d-3a66e2def504/67114567873.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac4c8a0e-a1ad-4af5-93a4-854502a40928/10146574952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86b59550-2fed-48e9-900a-6fb7dc6e1ce4/50584483679.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/future_value_of_annuity_due_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77a4069f-bbae-4dc8-9136-d6e50c79c768/devdas_free_online_streaming.pdfIn PDF document text
    • https://s3.amazonaws.com/damevusom/north_meck_high_school_supply_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ce1f08f-616b-4424-9bdb-2e1c748bae36/96646455468.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/56130657852.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/23428862283.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

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA9 4904 bytes
SHA-256: 5837d21ecb79e94c567221ba22a3038daf7a3ff79a4c8c9aee3a7d62554074e2
font_01_sfnt_off0000dc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC50 11432 bytes
SHA-256: ee7c04e6969bad8935ce843123f49cb46be728c69b9c3b14a100b34665acadd6

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