Malicious PDF — malware analysis report

Static analysis result for SHA-256 6247aafaf9c16e54…

MALICIOUS

PDF

73.1 KB Created: 2020-12-18 11:02:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 27484ca026b908277900ffae05d349bd SHA-1: a9b77ea55b8ed69ef20da1ba48a8fcf7c5acaa47 SHA-256: 6247aafaf9c16e54068715cc97278f1dac806f8f12de037a4f4091b12b9e447d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a link farm containing numerous external PDF links, and a ClamAV detection for a phishing trojan. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, suggests a lure related to a 'Fallout 4 step mod guide', likely intended to trick users into visiting malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/123?utm_term=fallout+4+step+mod+guide PDF link annotation
    • https://bubizepanawip.weebly.com/uploads/1/3/4/4/134480996/3498185.pdfIn PDF document text
    • https://kurikezexiwu.weebly.com/uploads/1/3/0/7/130775092/xetowakovuzisegud.pdfIn PDF document text
    • https://dinumaditu.weebly.com/uploads/1/3/4/4/134479473/wuveji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482426/normal_5fd6d18192b0e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/amapola_song.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/aitchison_college_lahore_admission_form.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/juwazepirazif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/987ac724-278f-49f4-9628-ba5945a1ca68/85797062750.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71008eeb-4c27-4250-8eac-616b0c4bfaec/49631320046.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/speak_now_2_workbook_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/fovogopewixaxerodo.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/free_spell_to_make_someone_want_you.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/bhartiya_rail_location_apps.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_off0000e12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12B 5228 bytes
SHA-256: 7581d8952bd3ee2eb9230fc230053540526ca18f9bd18236425fc5341fe4719c
font_01_sfnt_off0000f2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EE 10776 bytes
SHA-256: 59c6bb088a350abaaa8624c224916d650847ff8c61885dd0b86eaa1f623d7374

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