Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d91aa7bef570cb…

MALICIOUS

PDF

60.1 KB Created: 2020-03-11 03:55:12 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f0afb7298c74852a195a64def5598252 SHA-1: d7827b8d7ca97445b2b27851408507041f36ad83 SHA-256: 76d91aa7bef570cb2df928c57b8d2f78ffbb069db3bd841301494440813470e3
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. The ML classifier also strongly indicated maliciousness. The embedded document body text, though heavily obfuscated, contains URLs that are repeated in the list of extracted URLs. These links likely lead to malicious content or are used for SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://rpgd.stefanaarnio.com/uploads/1/3/0/9/130969795/130969795.html#pdf+file+merge+free
    • http://www.dorofabian.com/uploads/1/3/0/6/130639954/lisekoka.pdf
    • http://cureand.com/uploads/1/3/0/6/130639744/f86cc4748661c.pdf
    • http://www.bennettcoffeeroastingcompany.com/uploads/1/3/0/8/130873983/4812639.pdf
    • http://babymyo.com/uploads/1/3/0/2/130289797/pisotuniweseke-gelazuvowuz-loreke-nomosedox.pdf
    • http://purelyinbound.com/uploads/1/3/0/2/130270859/d80098.pdf
    • http://mistymountainholistics.net/uploads/1/3/0/9/130969810/2862885.pdf
    • http://prayingmom.life/uploads/1/3/0/4/130492889/8338477.pdf
    • http://charterfishingsd.com/uploads/1/3/0/4/130488251/wuduj.pdf
    • http://arlotrainor.com/uploads/1/3/0/2/130270762/3363862.pdf
    • http://djmomradio.com/uploads/1/3/0/5/130546971/530edca5c.pdf
    • http://www.mydtronic.com/uploads/1/3/0/5/130539584/mepudus.pdf
    • http://muninbikes.com/uploads/1/3/0/3/130323936/e7f02.pdf
    • http://mamabears-futurerns.com/uploads/1/3/0/6/130639059/3311817.pdf
    • http://brooqueart.com/uploads/1/3/0/5/130551805/gulizugodon_gowifam.pdf
    • http://mta-sts.bexleycelebrations.org/uploads/1/3/0/3/130312983/fidizepib.pdf
    • http://chickflickguide.com/uploads/1/3/0/4/130477252/7722624.pdf
    • http://mydentalpartner.com/uploads/1/3/0/6/130639743/b95dd2d6842b.pdf
    • http://osterauer.com/uploads/1/3/0/5/130590368/lajumuvisime.pdf
    • http://www.peter-rathbun.com/uploads/1/3/0/5/130543373/6833558.pdf
    • http://www.vickydewilde.nl/uploads/1/3/0/6/130621592/80be3f8a0.pdf
    • http://nycresistor.net/uploads/1/3/0/6/130603906/4086003.pdf
    • http://noodlecontent.com/uploads/1/3/0/4/130476885/tevaxafepujax.pdf
    • http://dragonridercomix.com/uploads/1/3/0/6/130639160/b535c95ed540.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009d31.bin
c1e176ed1dd118564529bcca135e9228292d49debe574cfd7f324a5a800ad932		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D31 6424 bytes
font_01_sfnt_off0000acd9.bin
798acc7c33ab47fa025ea9b0312936fe515fd362a1300967b57a8888a21caf8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACD9 8204 bytes
font_02_sfnt_off0000ccb7.bin
45c39c4315a5d00962143d4102937301eb2649728d6de39b959633cfc30365c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB7 16144 bytes

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