Malicious PDF — malware analysis report

Static analysis result for SHA-256 62cc5acabbe11071…

MALICIOUS

PDF

36.9 KB Created: 2020-04-15 09:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9f78c4e3a75e9efaf5885a4395adf266 SHA-1: 65ff52f909c4eda6a6a59b377ae381d0ef3fc3ef SHA-256: 62cc5acabbe1107153e678b023f43d6f3155f2069e43168170616125ebe10719
96 Risk Score

Malware Insights

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

The PDF file is identified as malicious by an ML classifier and contains a large number of external links, many of which point to other PDF files. This behavior is indicative of a link farm or SEO manipulation tactic, potentially used to host or distribute further malicious content. The document body, though heavily obfuscated, contains a URL that matches one of the extracted external links, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 http://disacorp.com/uploads/1/3/0/6/130604309/130604309.html#periodic+table+trends+activity+answer+key
    • http://placeandpurpose.com/uploads/1/3/0/4/130483886/tijeva.pdf
    • http://waynespaintingservices.com/uploads/1/3/0/7/130738543/wisaxozewero.pdf
    • http://theresabuechler.com/uploads/1/3/1/3/131379541/4bff6fabb339.pdf
    • http://francismediagroup.com/uploads/1/3/0/4/130476462/vogogesas-niferotezorosit-xanamimikelu-zaxamaketutuzu.pdf
    • http://intheworldministries.org/uploads/1/3/1/4/131407117/dosedekudelexe-wenaraw.pdf
    • http://brookdaleventures.com/uploads/1/3/1/4/131455463/3687127.pdf
    • http://teamanotherround.com/uploads/1/3/0/3/130323187/c82b32.pdf
    • http://seamf.org/uploads/1/3/0/7/130776740/8905241.pdf
    • http://stitch101airborne.us/uploads/1/3/1/0/131070367/gazilevebex.pdf
    • http://backfieldpllc.com/uploads/1/3/0/2/130289214/fb734af79.pdf
    • http://jonstuartpearson.com/uploads/1/3/0/8/130815140/5917910.pdf
    • http://ajconventions.com/uploads/1/3/0/4/130435909/muwomiwomatomox.pdf
    • http://redwoodsmedia.com/doc/14504271/periodic-trends-worksheet-answers-page-1--1
    • https://studyres.org/cms/lib4/NJ01000562/Centricity/Domain/907/Ch
    • https://studylib.com/periodic-table-trends-worksheet/
    • https://studylib
    • http://redwoodsmedia.pdf
    • https://studylib.%206%20Periodic%20Trends%20WS%20KEYS.Students
    • https://studyres.com/periodic-table-worksheet-answers/
    • http://periodic-table-1
    • https://studylib.com/2016/07/periodic-table-trends-worksheet-with
    • https://redwoodsmedia
    • https://studyres
    • https://studyres.net/doc/8214423/atomic-radius-practice-problems
    • https://teammlbrangersshop.This
    • https://periodic-table-0.com/periodic-trends-worksheet-answers-pogil/33916/
    • https://www.Students
    • 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_off0000667d.bin
d32fb19cf0e977e7fdbbdb5874f9c5fb822ecdceba99fcc4f9528a95eea8d59b
pdf-font-stream PDF embedded font (sfnt) at offset 0x667D 8180 bytes