Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f0a10b4ca712dc…

MALICIOUS

PDF

95.4 KB Created: 2020-12-28 12:52:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 197b54a8c76d203bb75094f31d81b81a SHA-1: 27f656ad7999ae2bcd7e3f6183c49bcf1e40f404 SHA-256: f4f0a10b4ca712dccb5fa0a65d8d14919562207d9f9e5e784b8d3dd0a3e61f93
214 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple critical heuristics, including PDF_MALICIOUS_REDIRECTOR_LINK and CLAMAV_DETECTION, indicating it is malicious. It contains numerous embedded links, with at least two pointing to known malicious or redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of embedded links and the heuristic firings suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9647

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
  • 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.
  • 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=cookie+shop+yummy+cooking+games In PDF document text
    • https://static.s123-cdn-static.com/uploads/4502870/normal_5fdd0bd02c248.pdfIn PDF document text
    • https://viwoposiruxeduz.weebly.com/uploads/1/3/4/6/134633276/niporid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393361/normal_5f96d44405b00.pdfIn PDF document text
    • https://cdn.sqhk.co/lilanoto/jcw3jif/69249880193.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dudurat/gilojutajejifaburamafopaj.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/14162521149.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/worksheet_personality_adjectives.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/minukeporonilajim.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/generac_pressure_washer_owners_manual_3100.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80D 6440 bytes
SHA-256: 2ce5a7286efefc5aae27ce1c31b3347e159d00bd30cf97f509a0b7f7d49caffb
font_01_sfnt_off0000f802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF802 5208 bytes
SHA-256: f586eaf7171856bc40b64d3de289b194596dbcf4149fbc1d25bd9b68a2cbf96a
font_02_sfnt_off00010996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10996 11884 bytes
SHA-256: 2cc43f264cd33941e360ac9aabfa7faec8d0a66255b752fcbe319e3e8fc7bb72
font_03_sfnt_off000124b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B1 11904 bytes
SHA-256: fcdf7180c2e3f51e0ab254d2b79db9f78d64faf8cb0152d80db1cc22322be0be
font_04_sfnt_off00014c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C2D 16140 bytes
SHA-256: 292d4ea321fc873f7b404b996a0f60dc73524810b07255476915d96a34f7c783
font_05_sfnt_off0001613a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1613A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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