Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d87f86ebfe50ae…

MALICIOUS

PDF

39.9 KB Created: 2020-08-23 10:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d91db936db0c91fccf76afbb1a25220d SHA-1: 18be4d37ba68e653d3fa6516b2c8ff3df6800caf SHA-256: 73d87f86ebfe50ae6d15d8a10da69356eabd14cad3a4cd549c3703c611555757
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with a critical heuristic firing indicating redirection to known malicious infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of a phishing lure for a 'free calculation'. The presence of numerous links suggests a link farm or SEO poisoning tactic to attract victims. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://ttraff.cc/pify?keyword=calcolo+codice+fiscale+free In PDF document text
    • http://files.artedwards.com/uploads/1/3/1/8/131871740/siteveviwu_bijamuvibono_raguxavata_dunur.pdfIn PDF document text
    • http://defuzida.gcmafproducts.com/uploads/1/3/1/0/131070702/dodupomavusilim-likubad.pdfIn PDF document text
    • http://files.steffenhurka.com/uploads/1/3/2/6/132682790/540499.pdfIn PDF document text
    • http://pezukako.theembshop.ca/uploads/1/3/1/4/131453832/0faecbf02a30.pdfIn PDF document text
    • http://petivimit.childemotionregulationlab.org/uploads/1/3/0/7/130775565/gasepavurilum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1673/9222/files/2017_hyundai_elantra_owners_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/wofifujovadirep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0100/4707/files/cement_plant_automation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/vivo_v5_whistle_notification_tone.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0445/3256/4132/files/vumaripexaxibezude.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0813/1233/files/14132581384.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/gewawaribatiruzi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4343/8244/files/azimuth_angle_calculation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1121/1425/files/gawiwojen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7101/9935/files/kotos.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 8

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_off00005d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D6D 4920 bytes
SHA-256: 698406a4401b27d400360aef0596a8d6378aa78c7dc8c0413634f98aa243ccb6
font_01_sfnt_off00006e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E2A 10764 bytes
SHA-256: 38e6ed44a461b503e4b3fbcc59aa9063d4112c2a29dd75ddfa907bee22d3577a

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