Malicious PDF — malware analysis report

Static analysis result for SHA-256 668517d1a3919bf6…

MALICIOUS

PDF

51.6 KB Created: 2020-03-30 09:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4cbb4bbb240a9eef3bc41c4834bf02e4 SHA-1: e705c4fbece7ee8866d45e0c48a0399569f87ff1 SHA-256: 668517d1a3919bf6896a42bf7a4b677c711c1ade1a7d023192b3a06b89f3e4aa
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of external links, identified as a 'PDF SEO Link Farm' heuristic. The links point to various domains, each hosting a PDF file with a numeric or slug-based filename. This suggests a coordinated effort to manipulate search engine results or distribute malicious PDF content. No scripts were extracted, and the document body is heavily obfuscated, making it difficult to determine the exact user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://adsl-63-204-18-8.benefitplans.org/uploads/1/3/0/9/130969761/130969761.html#sistema+musculo+esqueletico+anatomia+y+fisiologia+pdf
    • http://modernretailcollective.store/uploads/1/3/0/8/130874231/7655098.pdf
    • http://blackmomsstaylifted.com/uploads/1/3/0/8/130813550/2797104.pdf
    • http://add-focus.com/uploads/1/3/0/5/130590436/20f60c9.pdf
    • http://aarambhjourneys.com/uploads/1/3/0/2/130289641/lamedadefowet-gefuzi.pdf
    • http://jereobrien.com/uploads/1/3/0/8/130813645/tikewolaja.pdf
    • http://starplusmedia.com/uploads/1/3/1/1/131163788/sisawikoj.pdf
    • http://scadvocates.net/uploads/1/3/0/6/130639554/1343866.pdf
    • http://pueblotreeservice.com/uploads/1/3/0/8/130873715/sebejegiwawuwerofis.pdf
    • http://michellentherapy.com/uploads/1/3/1/4/131437516/8860645.pdf
    • http://hispanicresourcefamilyculturalcenter.org/uploads/1/3/0/2/130288401/1162ec9.pdf
    • http://histomedical.com/uploads/1/3/1/3/131383826/tataviwim.pdf
    • http://opvakantienaaribiza.nl/uploads/1/3/0/7/130739918/vodusovobiwis-fugapopawuda-jefelofe-tuvavuginarenuk.pdf
    • http://sssintheraw.com/uploads/1/3/0/4/130483163/viwarenoj.pdf
    • http://legaciesmentoring.com/uploads/1/3/0/7/130774964/sarovudogute.pdf
    • http://amaliebrenner.com/uploads/1/3/1/1/131164038/nivudugigiwu_nosilaniw_nigalesene_fugatofagevifat.pdf
    • http://ariadnabarbe-villa.com/uploads/1/3/0/5/130552053/96612963fec1da.pdf
    • http://wise-owlwellness.com/uploads/1/3/0/8/130873779/74eb9e8657.pdf
    • http://birdholidays.eu/uploads/1/3/0/6/130639665/wefonimoxukaboz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009f93.bin
8aa0caeec7d9a052c78c04a134a3a0f3db0e7629035585ae745d6ae27883b03c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F93 8512 bytes

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