Malicious PDF — malware analysis report

Static analysis result for SHA-256 73dd05a21eb17f2a…

MALICIOUS

PDF

122.4 KB Created: 2020-03-18 08:44:41 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7cf374bb90b12c04d2cb06fdb5372aa7 SHA-1: 747d1c2d9f8e71121691e0610d06218e273a4ddc SHA-256: 73dd05a21eb17f2a01703262004497e96fcfcd61f28b59e365bd5e366a8c1dca
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files hosted on unrelated domains. This behavior is indicative of a link farm or a mechanism to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous SEO-like links suggests an attempt to manipulate search results or redirect users to potentially harmful sites. No scripts were extracted, but the PDF structure itself is the primary vector.

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://pencilpenservices.com/uploads/1/3/0/7/130776075/130776075.html#oregairu+volume+12+manga
    • http://sparkyselectricalspecialists.co.uk/uploads/1/3/0/3/130323430/7282251.pdf
    • http://instantarabic.com/uploads/1/3/0/4/130478520/jezege.pdf
    • http://allhelmets.com/uploads/1/3/0/4/130435619/bawoduzutev_fenejekokulok.pdf
    • http://www.renewnow.me/uploads/1/3/0/5/130538839/3399786.pdf
    • http://conquerministries.com/uploads/1/3/0/6/130604031/6566c.pdf
    • http://mta-sts.mx.empowerment-time.com/uploads/1/3/0/7/130739595/7f0f0ca0f13645.pdf
    • http://asbinvest.com/uploads/1/3/0/3/130323724/e189b.pdf
    • http://bestofbothheatingnair.com/uploads/1/3/0/7/130739234/piduz.pdf
    • http://galvestonpersonalinjurylawyers.com/uploads/1/3/0/6/130620673/3975069.pdf
    • http://jbeautywigs.com/uploads/1/3/0/2/130271097/160ffd0d.pdf
    • http://hollywooddeathtour.com/uploads/1/3/0/4/130435972/rekujijilivopaw_zufezavi_berajebajinono_sudoduregugo.pdf
    • http://manzimvula.photo/uploads/1/3/0/8/130813652/zagalaviveni.pdf
    • http://gundeleskuvo.hu/uploads/1/3/0/7/130740591/78c4039dd.pdf
    • http://rcustombridal.com/uploads/1/3/0/4/130436439/2008891.pdf
    • http://cateandila.com/uploads/1/3/0/8/130815582/eb2a852.pdf
    • http://floridajewishfunerals.com/uploads/1/3/0/2/130271154/lugos.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_off0001ba38.bin
cfa58fb33c3ecee3aa6cd3f7cb4a28c503ab9cf69238b69f7ea3ab172ca44373		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA38 9252 bytes

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