Malicious PDF — malware analysis report

Static analysis result for SHA-256 61602e5fb6de5fb0…

MALICIOUS

PDF

40.6 KB Created: 2020-03-24 02:16:07 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 78b20b4e703c7ac21937e67029ed50d7 SHA-1: 3dc2aa3977072803e62fd5f301126a1c12d35b9f SHA-256: 61602e5fb6de5fb06e3bed135aa95d5d6f3733115a3050de6b59951d6fcfc2e0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the sheer volume of outbound links is highly suspicious and indicative of a malicious intent, possibly to distribute malware or engage in phishing.

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://teamgls.com/uploads/1/3/0/6/130620402/130620402.html#haluros+de+alquilo+quimica+organica
    • http://gailbliss.net/uploads/1/3/0/9/130969184/ririjafiduxuruv.pdf
    • http://redthreadtraveler.com/uploads/1/3/0/4/130489082/0822c.pdf
    • http://aurafximaging.com/uploads/1/3/0/8/130873990/5316479.pdf
    • http://mscalvin.com/uploads/1/3/0/7/130775876/2674955.pdf
    • http://manleyassocpc.com/uploads/1/3/0/4/130489467/pusumo-mubakelomad-bufamuv-xewalirinutazox.pdf
    • http://4evernorwoods.com/uploads/1/3/0/7/130775831/zudorefanubuguwas.pdf
    • http://mail.thebiocompatibledentist.com/uploads/1/3/0/8/130874221/mimubeluxefiw.pdf
    • http://www.gasingingconvention2014.com/uploads/1/3/0/7/130740060/munupuduruva.pdf
    • http://carpetcleanergrandrapids.com/uploads/1/3/0/2/130289271/vakakani-damolezirugij.pdf
    • http://hostmaster.kasperkreations.com.au/uploads/1/3/0/7/130739062/4e0f4.pdf
    • http://www.robertmccaskill.com/uploads/1/3/0/8/130815140/337aa5f.pdf
    • http://cachedistrictliteracy.org/uploads/1/3/0/7/130739437/4630833.pdf
    • http://pilltest.com.au/uploads/1/3/0/5/130590371/cbe59c3d0af23e1.pdf
    • http://filmmonk.org/uploads/1/3/0/4/130488513/sobexefarekikadufi.pdf
    • http://hostmaster.kelynnpottery.com/uploads/1/3/0/2/130289479/2313176.pdf
    • http://mx.tarjetaverde.net/uploads/1/3/0/4/130490421/4335e137.pdf
    • http://jeffgraymortgages.com/uploads/1/3/0/9/130969042/174421.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_off000071c0.bin
e9a9d41e6f9fd44ecaf874d09c880a9d87c6be71cc98557c444b7fb8623ef967		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71C0 9200 bytes

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