Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71a96381d50501a…

MALICIOUS

PDF

71.3 KB Created: 2021-02-18 21:11:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 10440f8f19c3be9b9a3d16b413ea4df5 SHA-1: 74ab9c360d581dddeb3b1601ccbf8e4742597bf8 SHA-256: a71a96381d50501ac52f7280ff18b8cedbeea8aa2a6fbcf2a747387f8029e2a7
272 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document acts as a link farm, directing users to various external URLs, one of which is identified as a malicious redirector. The document's content, though heavily obfuscated, appears to be a lure related to 'Osceola county iowa warrants', likely intended to trick users into clicking malicious links. The presence of numerous external links and the identification of a malicious redirector strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crophysi.ru/wix?keyword=osceola+county+iowa+warrants In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375342/normal_5fdbc7aec169e.pdfIn PDF document text
    • http://instgrmmverifiedbadge.com/the_crown_season_5_episode_7_castf3bqy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374373/normal_5fd1d1262232e.pdfIn PDF document text
    • https://vavetoros.weebly.com/uploads/1/3/4/8/134854671/novime.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450248/normal_600d0b5d028a6.pdfIn PDF document text
    • https://jobadenel.weebly.com/uploads/1/3/1/1/131164033/sogobop_napipuzed_xowono_geniboxinereg.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/3313798339457l8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370996/normal_600c8c5d99a55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459326/normal_5fff3056850bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474449/normal_5fdb320f617ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474978/normal_6010db7b4c1d9.pdfIn PDF document text
    • http://leqqurint.online/20852190779x0spk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470223/normal_60106ce0a7647.pdfIn PDF document text
    • http://justiciaforjustice.com/17136806634j883m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000db7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7B 5012 bytes
SHA-256: 341976a9b7fc05d1ce15dd45a69aa45d5dc396c3f2b1313fd26e2e0bc5eb0c6b
font_01_sfnt_off0000ecae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAE 10528 bytes
SHA-256: eaff15b317a5d51a135ace294daeae2d3ad1ad3c9884684df7f16435133ee68e