Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a19a7dc8b9134ca…

MALICIOUS

PDF

50.8 KB Created: 2020-04-12 13:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: efc568509ef5761d5f3488907237df32 SHA-1: ea5e9616826303d98b9e87774c459423b48dbb7a SHA-256: 8a19a7dc8b9134cae226ffad91978e4cf8156764651b6157d8bc700493779e8a
94 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body contains text related to economic concepts, but the primary malicious activity appears to be the distribution of links to external sites, likely for SEO spam or to host further malicious content.

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://rareperfectionbeauty.com/uploads/1/3/1/3/131379914/131379914.html#curva+de+phillips+desempleo+e+inflacion
    • http://fourcountyquiltersguild.org/uploads/1/3/0/8/130813518/a038c26d99478.pdf
    • http://yourcosmeticmall.com/uploads/1/3/1/3/131383541/7539555.pdf
    • http://sofuco.net/uploads/1/3/0/9/130970015/xedupinuxilaxeko.pdf
    • http://tk-talks.com/uploads/1/3/0/4/130435592/4994918.pdf
    • http://chrisministries.com/uploads/1/3/1/4/131437599/1482175.pdf
    • http://pineforestandover.com/uploads/1/3/1/4/131438510/23d79111c0ff.pdf
    • http://robertsenterprisesllc.com/uploads/1/3/0/2/130273845/7431084.pdf
    • http://oaklandsdental.com/uploads/1/3/0/2/130287934/badup.pdf
    • http://jonajarian.net/uploads/1/3/0/5/130551181/matakejumupisis_mosipudexajobor.pdf
    • http://jamesbrown4judge.com/uploads/1/3/1/4/131453154/niribidudugixos.pdf
    • http://sasikmoon.com/uploads/1/3/0/6/130603930/tamifasoladejeni.pdf
    • http://dansrecovery.com/uploads/1/3/0/2/130289441/bb1d43.pdf
    • http://gotothehouse.com/uploads/1/3/0/4/130436093/juxidemisiseposi.pdf
    • http://deedeescupcakery.com/uploads/1/3/0/6/130605347/naxun.pdf
    • http://prodigaltrader.com/uploads/1/3/0/6/130621383/risuviripojebak-pobaxojumavu.pdf
    • http://jonajarian.net/uploads/1/3/0/5/130551181/matakejumupisis_mosipud
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d0b.bin
e46023bec3afe131016c71e6d902e8bbce102aa9830e7832d38b4df4909d717b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D0B 9184 bytes
font_01_sfnt_off00009e5b.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E5B 2652 bytes
font_02_sfnt_off0000a7c2.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63
pdf-font-stream PDF embedded font (sfnt) at offset 0xA7C2 16036 bytes