Malicious PDF — malware analysis report

Static analysis result for SHA-256 d122113bfeb5f176…

MALICIOUS

PDF

75.8 KB Created: 2020-12-17 21:48:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 82e10a864f3edda86b2f4e935754881d SHA-1: ca15034d7555eb6f78a93e4afbe6026995a21d22 SHA-256: d122113bfeb5f176891c04c9dd69a14393bb0849ea802d207ccb1f5a8faeb43b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by multiple heuristics, including ClamAV and an ML classifier, and contains a significant number of external links, suggesting a link farm or SEO abuse for malicious purposes. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate an attempt to direct users to potentially harmful sites. While no scripts were explicitly extracted, the nature of the PDF and the heuristics suggest it's designed to exploit vulnerabilities or lead users to phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://trafficel.ru/123?utm_term=manual+height-adjustable+heavy-duty+steel+standing+desk+frame PDF link annotation
    • https://movuvoxuwonorad.weebly.com/uploads/1/3/4/6/134667433/xegepunonusivokesis.pdfIn PDF document text
    • https://gexirirexov.weebly.com/uploads/1/3/0/8/130874239/8396885.pdfIn PDF document text
    • https://nakalefa.weebly.com/uploads/1/3/4/5/134522788/6022019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408711/normal_5fa07022e84cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390329/normal_5fc98cc668e97.pdfIn PDF document text
    • https://sotivozorome.weebly.com/uploads/1/3/4/7/134733800/419c877c7c1f8c.pdfIn PDF document text
    • https://sapezirotup.weebly.com/uploads/1/3/4/5/134576964/lazomafak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457330/normal_5fa7aeee20e58.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5a1cdea4a794d566579b2/t/5fc616244f98375720af60f7/1606817319243/web_of_life_organic_farm.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc586961c8c741314515584/t/5fcc701e3ff1011540e97d8b/1607233566515/15928937005.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f028f9866f3fd2d48e87/t/5fcb9a8e6fd93023bc084844/1607178894881/bridge_construction_simulator_hacked_apk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5b8f9e2fce462bcacebd6/t/5fd6e79cffab5d3c560dd39d/1607919517179/jasipipudijifedinafanezap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b70187ab-fe63-4217-a797-4d45f38baebd/dell_wireless_1390_wlan_mini_card.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1321e2e34347c7045f8f9/t/5fc2e517f81c9a2a0c024161/1606608152799/rsi_checklist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e44c1cba-5363-4463-a82c-618c66ebd06a/hollow_knight_breakable_floor_locati.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD079 5800 bytes
SHA-256: c597f55154604b1daf707cc400f6dc8b047f1a70d2d7a9212b96bc54971dedf6
font_01_sfnt_off0000e439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE439 11256 bytes
SHA-256: ba82daf86cf51a78d319d146b7cd17784bf16d6206f4bc56a716e60376814d06
font_02_sfnt_off00010a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A01 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6

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