Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae35511dd7c6443a…

MALICIOUS

PDF

43.6 KB Created: 2020-05-15 23:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b4169ab0246b392d6f1795da21674b7 SHA-1: bb9851319c6828b0c1676e6ff147ef70c21e13d0 SHA-256: ae35511dd7c6443afed5b4cdfba3c4c96d61f6fbae3be29e62ac40476566d079
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the presence of numerous external links suggests a delivery mechanism for further payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dosfriocom.com/uploads/1/3/0/5/130588269/130588269.html#chrome+app+android+not+working
    • http://northoaksrealtor.com/uploads/1/3/0/6/130604973/65c058751c908a5.pdf
    • http://sdhlawoffices.com/uploads/1/3/1/4/131406448/midepa.pdf
    • http://stevenstrekking.com/uploads/1/3/0/8/130814063/lakorusabukul-lokadi.pdf
    • http://alsforms.com/uploads/1/3/0/8/130814706/ruwamedofolexojed.pdf
    • http://rivertonselfstorage.com/uploads/1/3/1/4/131406440/7619521.pdf
    • http://aussieantiquefairs.com/uploads/1/3/1/4/131452961/wanipe_woxonebimojako.pdf
    • http://fixerexperts.net/uploads/1/3/1/3/131381006/dunubibijixet.pdf
    • http://zeebahomestaging.com/uploads/1/3/0/9/130969305/e7c4813c2542.pdf
    • http://acousticfloydtribute.com/uploads/1/3/1/4/131406381/ec0817.pdf
    • http://blueprint-project.net/uploads/1/3/1/4/131437695/wuduxog-repogewotosu-temevixa-fazemewidofor.pdf
    • http://probateinsacramento.com/uploads/1/3/1/6/131636726/3323631.pdf
    • http://theatlantadoula.com/uploads/1/3/0/6/130604539/zenufop_lozuz_papikuf_vanetixewevumew.pdf
    • http://hybridmartialarts.org/uploads/1/3/0/8/130813762/jajemesu.pdf
    • http://danscentrumnorr.com/uploads/1/3/0/8/130814687/saseji-poluna-ruvumevudomifo.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_off00007f05.bin
8e9dad9347f0983bf65c4564917345e1ac1fcb72594436fb08937b3f4da8d9e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F05 10500 bytes

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